 question is in front of you. Can you read the question? I am reading it. The magnesium ribbon about 2 centimeter long and a piece of coal were taken. X is magnesium ribbon and Y is coal and there are 4 students PQRS. Now you have to tell which student has done the right experiment. Flame color is there and residue obtained is there. So flame color for the P student is corresponding to X is disling, white flame and gray shares and for Y yellow is flame and black as. Yes one is A, two is B, three is C and four is B. Yes so you can see the options. If you face any difficulty please let me know. You have last 18 seconds left. Read the options carefully. Okay time's up and we are going to see what results. Okay 40 students have answered right. I want to tell you magnesium burns with a disling, white flame or very beautiful flame but you can't see without any protective glasses. It is like white flame and when carbon burns it burns with a sooty flame. So that is the correct answer. B is the correct one. Let's see the leaderboard. Okay Vish, Vesnav is leading. Don't worry we have so many questions left. Moving to the next question. Read the question carefully. Which of the which two experiments set up would you choose to prepare and collect hydrogen gas in the laboratory? Please read the question carefully. Please see the options carefully and then answer. Please read the options carefully. How can you prepare the hydrogen gas in the laboratory? The question is simply related to preparation of hydrogen gas but you need to take care of which metal is used and second thing is what type of set up should be there? Okay any any problem? 1 and 2 are the same. 1 and 2 are not same idea. 1 is 1 and 3 and B option is 1 and 4. No options are same. Yes see carefully. Please read question carefully and last 10 seconds left. Okay time's up. Fine let us see how many of you have answered it. Oh my god. Let's see how to do this question. If you see to solve this question I want to take you to the slide of the question and question is this. If you have the if you want to prepare the hydrogen gas. Okay just one second. Yes can you see my screen hydrogen gas you want to prepare which is the best setup to do that. So answer of this question is D. D is the answer that is 2 and 3. I want to tell you why 2. First if you see the difference in 2. 1 and 2 is the the nozzle is inside the liquid. You don't put nozzle inside the liquid because hydrogen when zinc reacts with HCl when zinc reacts with HCl it will give you H2 plus ZnCl2. Okay it is not a balanced chemical reaction you can balance it. When you get the hydrogen gas it will come outside and it will go through this nozzle and it will report here. Once hydrogen gas is taken out now you need to put the nozzle inside the water and due to the displacement of air due to the displacement of water it is the downward displacement of water. Hydrogen is collected here you can collect the hydrogen gas. You don't use oxygen can anyone tell me why you don't use oxygen in collecting hydrogen gas. Oxygen burns. Very good. Oxygen reacts with hydrogen and there can be explosive reaction that's why we collect the hydrogen always from the displacement of water 2 and 3 and it out and it out okay fine next question okay I can't put the questions like this because any because we are going to see the result also we have to be continue the process in mantimeter only okay so next question is in front of you first we will go into see the leaderboard so the results are okay Aditya NPS RnR is leading the show right now and he is the fastest good Aditya keep it up and the next question is in front of you please read the question carefully these are all NTSC level questions so read the question carefully don't make the mistake observe the experiment carefully China dishes there containing copper powder and you have a burner in the above experiment copper powder turned to black colored product on heating it is due to the reason that copper has absorbed heat copper 2 oxide is formed it is Roman 2 it's like oxidation state of copper is 2 they want to say like that third option C option is copper 1 oxide is formed that is copper having a one oxidation number both 1 and 3 are correct which is the correct answer among these four don't hurry you still have time take your time and then answer which oxide is going to form whether oxide will form or not that is also a doubtful situation so you have to select answer according to that yes copper powder why we do make a powder to increase the surface area those were doubt why it is why we powder the substances because to increase the surface area we powder the substance now you have to tell me what will be the possible product and the answer for this question is is we are going to see how many of you have answered it properly and answer oh my god no one has answered a but only 20 students have answered be and the answer be is the right one because copper reacts with oxygen form see you oh see you oh is plus two oxidation state of copper it does not form see you to oh it forms see you oh so answer is be if anyone has any doubt please let me know why not be okay let us see the D option what is the D option the D option says that okay just a minute the D option is so here you have both one and three are correct copper no three is not at all correct my dear copper is in plus one oxidation state in three so answer is be only copper two oxide will form did you understand yes very good no Aditya what happened I told you now both one and three are not correct copper one oxide will not form copper two oxide will form so how D can be the answer how is copper one oxide form yes exactly but is the statement of one correct copper has absorbed the heat okay copper is getting oxidized copper is getting oxidized copper plus oxygen because what happens when you heat the substance I want to say that it increase the reactivity of a compound actually it is not absorbing heat but the later you will learn one thing that activation energy of the reaction get reduced it is not like copper has absorbed the heat the activation energy it's like climb climbing up a hill it's like this to make the product if copper and okay one minute if copper and oxygen are reacting to make the product as a copper oxide copper has to go this much height it's like energy barrier so that energy barrier is covered by or is given by the heat supply it is not like copper is absorbing heat the energy required the heat because otherwise we call it as a activation barrier activation energy or activation barrier this much energy is required to jump and form the product is it clear copper reaction is this copper plus oxygen to give CuO any doubt please let me if anyone has any doubt no very good moving to the next question always remember activation energy can be can be taken as a like climbing a hill so every reactant needs to have that much energy so that it can go to top of the hill it is like an example it must have that much energy to form the product that's why heat is given let us see the leaderboard now and aditya NPS are NPS are in our is still leading or not we will going to see now okay fine smooth NPS are in our very good smooth we are going to do the next question now okay some route whatever if I pronounce it wrong please ignore it okay a dilute solution of sodium carbonate was added to two test tube one containing dilute at CL and other containing dilute NaOH the correct observation was brown colored gas liberated in test tube brown color get liberated in test tube B a colorless gas liberated in test tube a a colorless gas liberated in test tube B which is the correct answer which is the correct answer among this four yes in last class we discussed about sodium carbonate reactions with both of these I gave you one hint also that time and we discuss not one question we discuss so many questions related to this concept so I'm assuming this time you are going to score all of you are going to write the correct answer only 30 more seconds left okay so CO2 will come in acid are you asking you are not allowed to ask Aryan after the quiz after 18 second I will answer your question sodium carbonate and is added to HCL and NaOH okay last four second and question number fourth answer is see very good but still 39 students have answered why not all of you have answered this question properly fine we will going to see the leader that thing so how to solve this question we are going to check so see I told you in the last class that whenever you see Na2CO3 whenever you see Na2CO3 it is nothing but sodium carbonate and sodium carbonate is a salt of a strong base weak acid so it is basic in nature because it is formed by NaOH a strong base and weak acid when it reacts with HCL double displacement will happen NaCl will form plus H2O plus CO2 if you remember I told you whenever H2CO3 forms it will break into this so colorless gas is obtained answer is 3 any doubt that is C if anyone has any doubt please let me know yes it is unstable very good now we are moving to the next question be ready for that and next question is in front of you first we'll see the leader board is Samarudh still leading the show one minute fine Sneha very good Sneha moving to the next question please read the question carefully the question may be big to answer but read the question you can see the reactions given you have to select the correct answer please take your time I have seen two students have already answered and it's not just five seconds how you have answered God knows carbon plus O2 gives CO2 AGBR gives AG plus BR2 ZN plus copper sulphate CA plus O2 and BACL2 plus H2SO4 okay CO2 plus oxygen okay think properly maybe one question have two possibilities please read the option carefully you have to select the best answer again I am repeating select the best answer 29 seconds you have take your time there are options that is decomposition also and there is a double displacement also there is oxidation also there is displacement also please take your time and then answer okay fine last four seconds okay the answer of question number five is B very good students 42 have answered properly so okay fine if anyone has any doubt please ask the question was very easy carbon plus O2 gives CO2 that was the combination reaction okay do you want me to explain please let me know please write why if you want me to explain please write why please type why if you want me to explain why why okay everyone is writing and please write why no fine it's fine if you have doubt and you didn't understand I will describe it no okay so it's carbon plus O2 gives CO2 is a combination BACL2 reaction was the double displacement reaction AGBR on heating gives a decomposition that is AG plus BR2 like that and one was the zinc plus some salt of the other acid was other metal was there that is the displacement reaction more reactive displaces less reactive from it solve solutions I hope you understood please see the leaderboard and check your position Sneha is still leading or not we are going to see now okay Sneha is still leading and Vesna was the fastest to answer Vesna be careful in next question take your time and then answer okay the question is in front of you C4H10 plus 13 O2 gives you and it gives you carbon dioxide and water AGBR gives AG plus BR2 BACL2 plus H2SO4 gives this but there are so many options so many options given and here it is a multi correct these questions are kind of questions asked in NTSC exams be careful to answer each and every question okay ABCD is 1234 is same like is equivalent to ABCD please take your time and answer AGBR is giving AG plus BR2 those who have attempted last question properly this may help they may get help in this question okay the reaction is the AGBR reaction is used in a photographic place I told you if you remember I explained it is used in black and white photography and BACL2 reaction is a kind of very important example and the above one is like hydro carbon when reacts with oxygen gets used CO2 and water okay we are going to see how many of you have answered it correct okay 24 students 27 students have answered it wrong I want to explain you this question but I will not take much time in explaining you have to understand it okay fine see the question is like C4H10 plus O2 this is oxygen okay it is a combustion reaction let's let me match all the options so if I try to match this it is like okay so this is the answer this is the combustion reaction as well as it is a exothermic reaction if you talk about AGBR AGBR is nothing but a decomposition reaction as as well as it is a endothermic reaction with the help of light it takes place that is S and R last option BACL2 is a precipitation of white precipitate of vagum sulphate precipitation means U U and the next is double displacement T so answer is B RSUTTQ hope you understood this yes moving to the next question okay we will see the leaderboard and then we'll move to the next question Sneha Vaishnav Aniket all are on the first three positions but now now very good Harshita that's a big jump okay fine now we are going to go for the next question take your time answer it properly question is in front of you consider the following statement take your time I'm again repeating take your time it is possible to write a symbol equation even if we do not know the word equation next question a chemical equation is always written under NTP condition okay but those who don't know NTP I want to tell you it's a normal temperature and pressure conditions see option in a chemical equation the diatomic gases must be written in molecular form must be written in a molecular form okay fine there are four options given to you you have to select the best answer 42 students have answered and you have 42 seconds left so still you need to think there are options where you have to think and then answer and this is a part this is a this question was taken is taken from a topic which tells about the chemical equations so those who were saying sir why again we have a chemical equation they should know that you should answer all the questions properly if anyone got 100 percent marks this means that you are pro in that chapter but I don't think that anyone of you have done all the questions right maybe you are there are some students but we'll see after the result okay time sir and the answer of this question is B for Delhi okay all reactions are not necessarily to be at the NTP you may have the many reaction at very high temperature you may like you okay if you if I tell you like some reaction is taking place at very very high temperature very very high pressure okay so it doesn't mean that you can't write or that let's say you are writing the Haber's process N2 plus H2 it is taken it is carried out at very high pressure so you need you know how to write the equation so you can write the equation if the reaction is even not in the atmospheric temperature and pressure condition or normal temperature and pressure and the second the second point was second point was that can you write the symbol equation without word equation you can't write symbol equation without word equation for what simple equation we need okay H2 hydrogen is reacting with oxygen to give water this means you need to write H2 plus O2 gives water H2O and the last option was for the diatomic gas you always put the molecular form you never write N plus 3 N plus 3 H can you write like 3 N plus 3 H Gibbs okay one just a minute can you write like this one N plus 3 H Gibbs NS3 can you write like this one N plus 3 H Gibbs NS3 no you can't write N plus 3 H you need to write N2 plus H2 Gibbs NS3 so I hope you understood the concept okay okay incognito fine who is the incognito next question take your time to answer the question consider the following statement oxidation is the loss of electron from a substance reduction is being of electron by a substance the formation of any steels by the action of sodium and fluid is an example of redox reaction this is relatively easy question so maybe it is easy or tough I don't know it depends on you so but don't make mistake take your time and then answer yes so you have 50 more seconds left let us see how many of you are going to help with the correct answer okay NA plus and CL minus I want to tell you it's nothing but it's an ionic compound and how are ionic compound form you have to think 58 students have answered still you have 25 seconds left those who have not answered please answer it quickly okay fine so last five seconds you have and the answer is D for Delhi oh my god only still there are many students who have not answered okay fine so now we are going to discuss 30 students have given wrong answer and 31 have given the right answer question was very easy I want to tell you that one thing is oxidation is loss of electron reduction is gain of electron two options and how NACL form I want to explain you this question so how NACL form we will discuss so I think question was fine so the question was this question number eight yes so it says that oxidation is a loss of electron it's fine reduction is a gain of electron it's fine I don't think that you have doubt but when NA and CL2 reacts they will give you NACL and this is the two times of NA two times of NACL okay now if you see the oxidation number change zero plus one that is a oxidation with the for the NA oxidation what about CL2 this is reduction from zero to minus one reduction it is a kind of red ops reaction D is the answer any doubt yes so what we can say CL is taking the electron from sodium one electron is going from sodium to CL understand it is also a combination reaction right okay fine moving to the next question okay if anyone has any doubt please ask me okay we are moving to the next first we'll see the leaderboard 50% students have done this question wrong but we will see what is the new scores and new scores are okay fine who is the incognito we have to think we will get to know after the class I think or after one question okay so next question is in front of you which of the following is an alkali please take your time and then answer which of the following is an alkali okay don't answer it fast you may get you may make mistake in this question because options are very good options are very good you have to think which is the correct option options are calcium hydroxide potassium hydroxide magnesium hydroxide and calcium carbonate which is the best answer to this question okay what happened ananya tell me question is not displayed ananya question is which of the following is an alkali a is calcium hydroxide b is potassium hydroxide c is magnesium hydroxide and d is calcium carbonate a is calcium hydroxide b is potassium hydroxide c is magnesium hydroxide and d is calcium carbonate a calcium hydroxide b potassium hydroxide c magnesium hydroxide and d calcium carbonate which among the following is an alkali okay fine and the answer to this question is b very good 37 students have marked it right answer is b potassium hydroxide is an alkali the definition of alkali is soluble basis koH is a soluble base calcium hydroxide is not a soluble in water magnesium okay we say it's a partial soluble partially soluble calcium hydroxide partially soluble magnesium hydroxide partially soluble calcium carbonate is completely insoluble so answer is b koH okay we are going to see the results now okay fine moving to the next question the question is which of the following gas is evolved on reaction with dilute HCl dilute hydrochloric acid with sodium sulfide sulfite ph it e sulfite options are carbon dioxide b hydrogen c sulfur dioxide and d sulfur trioxide which of the following gas is evolved on reaction with dilute hydrochloric acid with sodium sulfide carbon dioxide hydrogen sulfur dioxide sulfur trioxide don't guess because options are very good take your time and then answer sodium sulfide sodium sulfide if you know there are so many sulfate sulfide sulfide there are so many hypo sulfide per sulfate like that so you need to think what is the sodium sulfide okay fine so it's the last eight second left four three two one so the answer of this question is C very good sodium sulfide is Na2 SO3 Na2 SO3 sulfide Na2 SO4 is sulfate SO4 is sulfate SO4 2- is sulfate SO3 2- is sulfide so Na2 SO3 plus HCl gives you double displacement gives you H2SO3 and in last class I told you whenever in the product H2CO3 forms you will break it into H2O and SO2 any doubt please say why H2SO3 breaks into H2O and SO2 so SO2 is the answer any doubt please raise please write why so I will write the reaction otherwise I'll skip please write why if you have doubt no fine moving to the next question plus one for writing reaction okay if you are not written reaction you would not write the correct answers for this type of question okay I think this time who is leading adan oh my god here adan is attempting very good adan next question is in front of you take your time and then answer the question please read the options carefully okay sir could you read the question I it's not visible for me okay okay leave this question just leave this question it's not visible leave it for everyone it's not visible okay fine so leave this question leave this question don't enter if you enter you may lose the marks okay fine moving to the next question okay so moving to the next question please read the question carefully which one observation is correct according to effects of acid and bases on some indicators please take your time and answer the question which one observation is correct according to effects of acid bases on some indicators dilute HCl is used dilute H2SO4 is used calcium hydroxide is used and magnesium hydroxide is used you have to tell the effects on the various indicators what is the effects on indicators calcium take your time and answer this question with the help of this question I want to tell you one important thing so after finishing this I will tell you that okay fine so the answer for this question is okay fine so answer for this is okay 36 of you have answered it right very good now I want to tell you very important thing related to this question why I have added this question so that I I can tell you one important part with the help of this question so Christian was please what is the effect of and indicators so dilute HCl on red litmus and all you know that so I want to tell you one thing this question is related to red litmus blue litmus phenoxyline and methyl orange but if I give you one new indicator can you tell me what will be the answer if you have a red cabbage if you have a red cabbage what will be the color change can you please write in the neutral you have three options neutral acidic and basic please write the color of red cabbage I want to see how many of you know this color of red cabbage in acid neutral and basic medium okay acid is red okay fine what about other I gave you this as an assignment okay purple purple green fine okay fine neutral is purple I want to tell you the answer for this question I think most of you have answered with red cabbage can't identify after the neutral solution here you will have the color as a red only it can't identify because it's all it's acidic in nature base will give you the green color so this is a very important part one more question I want to ask what is the methyl orange it is given in this methyl orange always remember methyl orange always give you there are again three and AB what is the answer for NAB methyl orange nap methyl orange nap okay wrong anyone else methyl orange uh no wrong it's a neutral acidic and basic it's okay fine one student has given right anyone else okay red Shraduli anyone else okay right in the same order because there are so many so many messages coming up so I can't read all the messages okay one so three students have given right oh our wine very good Shraduli okay those who have given the right answer I'm telling you what is the correct answer for this on methyl orange it is yellow or neutral it is orange only because the name is methyl orange and for acid it is red and for base it is yellow for base it is yellow so I remember it like mobi methyl orange base or sorry not wine methyl orange base yellow otherwise acid is red here also acid red red cabbage one last question phenol phthalene what is the color of phenol phthalene in basic medium very very important it turns pink and when it is an acidic medium no effect on phenol phthalene very very important point okay and the litmus is you know all the litmus color the last question I want to ask you like what is the universal indicator color change universal indicator if you have a universal indicator and you have let's say let's say ph is seven ph is seven means a neutral solution can you tell me what is the color of a universal indicator at ph seven I can bet that most of you will give the wrong answer colorless wrong purple wrong blue wrong you wrong very good many of you have given right answers so answer is green color is the neutral solution ph is neutral it is green it is a very different okay if I want to ask one more thing if one is blue and one is purple one is blue and one is purple which you are going to say that which is more acid which is more basic which is more basic when one is blue and one is purple any idea purple is more basic very good that is the important part this is more basic and this is less basic okay and you know that red red represent the red represent the acidic strength okay fine so this is all about the methyl orange moving to our next question get ready for that so next question first we'll see the leaderboard and leaderboard says that okay so Aniket is leading just moving to the next question moving to the next question I skipped one point just tell me what will be the ph of the whether it's acidic or basic if universal indicator gives you yellow color if universal indicator gives you yellow color what is the solution is it acidic or basic universal indicator very good it is acidic and if it is orange if it is orange then orange then acidic now last question orange and yellow which represent more basic solution among orange and yellow which represent more basic which represent more basic okay oh my god many of you are wrong which represent more basic solution among orange and yellow the answer is answer is yellow not orange I want to color I want to tell you the colors first is the red then orange then yellow then green then blue then purple red orange yellow green blue purple please remember it it's a very very important okay fine yes yellow is more orange is more acidic very good next question is in front of you okay if we have the two test tubes A and B containing HCL and CS3COOH on mixing both acids which are having pH equals to 2 and pH equals to 6 pH of the resultant solution will be what you can see in the diagrams given you have to tell the pH of the resultant solution pH of the resultant solution will be more than the the values given to you like like more than 6 or less than 2 more than between 2 and 6 and pH will be 7 maybe it get neutralized so it will give you the 7 pH okay 57 have answered still you have 22 seconds left I think you can read the question properly 58 now we have to answer it past students only 10 seconds left those have not answered please answer it okay fine the answer of this question is C more than okay 23 29 students have answered it wrong so one thing I want to tell all of you see if you have these type of questions if you have these type of questions the solution is very easy yes yes I will tell you wait wait wait please give me one second okay fine so see how to solve these type of questions whenever pH is given to you okay pH is 2 pH represent the H plus strength pH 2 and pH 6 so what I will write less the pH more the acidic more acidic means more acidic means more H plus concentration more H plus in the solution pH 6 less acidic less H plus okay now try to understand if you mix the solution it is having a more H plus okay let's take let's take the value so if it is having a more H plus and it is having a less H plus you know the volume got doubled so try to understand like this let's say it has it is having the 5 H plus I'm just giving a random example because you don't know how to calculate pH that's why I'm giving you this example you have a 5 H plus and let's say this is having a 2 H plus and volume is one liter and volume is one liter when you mix it you got 2 liter volume but H plus r7 now now if you calculate the ratio actually the concentration of H plus concentration of H plus is nothing but number of H plus that we call as a moles divided by volume so if you see 5 by 1 is in the first case if I call it as a case a 5 by 1 in case of a 5 by 1 concentration in case of b 2 by 1 concentration but in case of c 7 by 2 is the concentration this is the case c where you have already mixed so now calculate which is the higher this is all like a pH so it is the highest concentration lowest pH that is 2 2 by 1 is definitely it is like a pH 6 so pH 6 is there now 2 by 1 7 by 2 comes between 5 by 1 and 2 by 1 7 by 2 is nothing but 3.5 so 3.5 is come between 5 and 2 that's why answer is 3 if anyone has any doubt please let me know it is totally based on concentration of H plus concentration of H plus okay can I say that concentration of H plus will reduce as compared to as compared to test tube A test tube A any doubt please let me know if anyone has any doubt no and it is also representing CS3COH is very very weak acid so the acid gives the reaction like this it is actually a reversible reaction H plus plus CS3COO minus reversible means all CS3COH is not breaking into H plus and CS3COO minus am I clear so that's why pH is very very high but in case of HCL whole HCL will break down H plus plus CL minus there is no reversible sign but here you have a reversible sign okay so next question is so first we'll see the leader board okay so who is leading this time Aniket Gupta INR 10 very good Aniket moving to the next question okay I will answer this question after finishing this how it is reversible in case of weaker acid MoMita they I will tell you after this question do this question then I'll explain how do we separate this mixture okay wait I'll answer this question first you do this KNO3 is given to you AGNO3 is given to you MGCL2 is given to you NH4 whole twice CO3 is given to you and NACL is given to you what is the match of ABCD and E what is the correct match for ABC and DE you have 47 seconds left and answer for this question is take your time write the reactions how these salts are formed if you remember how the salts are formed you may get the answer okay I think very less have answered this means that you people are thinking and you are going to write the correct answer yes okay so time's up and the answer for this question is okay 26 has answered wrong 28 have answered right rest have not answered at all okay fine why you people have done this this question is not that tough so question is like you have the different salt and if you remember salts are formed by crisscross method okay so KNO3 if you remember K is positive K plus and NO3 minus by the crisscross of KNO3 okay I'll write like this K plus NO3 minus okay now KOH it must have formed from KOH because and it must have found from HNO3 when you make it react double displacement neutralization reaction KNO3 with H2O will form similarly AG plus I will write plus NO3 minus I will write same thing what you are going to write for silver okay now here you have a nitrate nitrate and other than that other than that it's a silver hydroxide AG OH whole twice plus HNO3 will give you this product similarly MG2 plus and Cl minus crisscross give this so with plus just add hydroxide with minus add H plus so you will get HCl HCl is one of the reactant and MG OH whole twice is another reactant similarly NaCl similarly NH4 and CO3 NH4 CO3 is nothing but NH4 whole twice CO3 is nothing but it is our crisscross method but if you remember NH4 is one of the ion CO3 2 minus is one of the ion by crisscross method you will get NH4 whole twice this but you want to tell the acid and base with plus you will get the hydroxide that is NH4 OH and with carbonate you will put H plus so that is H2CO3 understood okay those who have searched the elements I am telling you it's not the good way if you are okay tell me for answering this you have searched the elements and you got the answer that's a different point did you understand the method how to tell the product if I give you very random example a very different example let's say zinc phosphate Zn3 PO4 whole twice can you tell me what is the acid and what is base now tell me then I will get to know whether you are right or wrong Zn3 PO4 whole twice which is acid and which is base which form this salt can you answer right full thing which is acid and which is base now see many very many few of you have answered okay it's wrong Aryan anyone else no one has given the proper answer very good momita day wrong Kurov Sneha right the full answer Surya wrong Aslesha right luxe right okay again same thing Zn plus 2 PO4 3 minus with plus 2 you will put OH minus Zn OH whole twice with PO4 3 minus put H plus S3 PO4 this is the way to tell which are the acid and which are the base which form the product okay now one student has asked likes are why weak acid does not dissociate completely you know what happens because there is a in weak acid you may not get reversible reaction because these are not having tendency to lose H plus so this reaction tries to goes in backward direction these reaction tries to go in backward direction because it does not lose H plus easily okay so that's why these reactions are reversible reactions understood momita but in case of HCL it will break into H plus and CL minus understood okay fine now someone has asked how to separate see these are the soluble things all this if you mix these two things you will get H plus you will get CL minus you will get CS3 COO minus you will get you will get that's it CS3 COOH now you can't separate like CL minus and CS3 COO minus you you can do one thing just put some some ion which can form precipitate with CL minus can you answer this how to separate CL minus and CS3 COO minus who can answer this if these two are mixed in one salt if these two are mixed how can you separate anyone how can you separate if you have in a test tube these two ions how can you separate no one not electrolysis anyone else you have these two ions acetate and CL minus how can you separate okay you add AG when you add AG CL will precipitate and CS3 COO minus will remain as it is did you understand someone has asked very very good question who was that I forget his name that how to separate these two just add AG so what you are going to get AG CL will get deposit on the bottom and CS3 COO minus remain in the solution understood okay what about NA NA remain as it is NA CL is soluble it will not precipitate AG CL is precipitate NA plus remain in the solution don't worry understood okay when you add NA both are soluble your purpose will not get solved NA CL is soluble CS3 COO NA is soluble you will not get precipitate you have to add something which will form precipitate with one and soluble with other understood very good question okay fine to separate two things always remember you add something which is soluble in one and insoluble in other let's see the leaderboard and see the and today's result and today's result says that the one who win the squares is incognito okay okay why not soluble both and then crystallize my dear when you crystallize huh you can do this thing but you know what will happen you can do this thing also but there must be very huge difference in the temperature of the crystallization when crystallization happens understood because there are chances that when you crystallize one one the other salt will also get crystallized so it is a very carefully you have to do that so we don't go for the expensive techniques when you have some easy techniques to carry out understood easy technique is what just add the more just add something which will form precipitate understood okay fine thank you all of you hope you understood something some new things today thank you