acid bases and salt grade 10 science cbse part 3

[00:00:06]Hindi days, Hindi Pradesh.

[00:00:13]>> Okay. Shall we start our work please?

[00:00:14]Now look here. Yesterday because of some few idiots who wanted to play classes got interrupted. Today it will not happen.

[00:00:36]Get into the house.

[00:01:11]Good evening. Subash.

[00:01:15]Say listen everyone.

[00:01:29]Tunga if tungarda means see opening and getting sham's photo.

[00:01:45]Oh >> Yes, I'm seeing those children who are present. Everyone listen. Now I was talking about acid and base. Now when I started acid and base I had some discussion about the properties of acid and properties of base.

[00:02:18]Stand here and discuss about the properties of acid and base.

[00:02:26]Checking attendance. They are also checking.

[00:02:32]Just check your button.

[00:02:34]Keep checking your button >> only. Both acids and base properties.

[00:02:40]>> Uh, acids are usually sore in taste.

[00:02:44]Bases are usually bitter in taste.

[00:02:47]>> Acids have a corrosive nature.

[00:03:02]>> You speak all the properties.

[00:03:05]Acids usually have pH less than seven.

[00:03:09]Bases usually have their p ph pH above seven. That's all.

[00:03:19]>> Hydrogen >> acids have degree of dissociation. What is the meaning of degree of dissociation?

[00:03:30]The meaning of this >> meaning of degree of dissociation says >> rate of rate of dissociation of H+ ion mean how fast H+ ion will get dissociated in the molecule. that much strong acid that is after that we discussed about mono acidic base monobasic acids understood or not. So monobasic acid and acidic base monobasic acid and mono acidic base give me one example of mono basic acid.

[00:04:22]Monobasic acid I want you to type and send me monobasic acid. Ma'am is not the answer. You have to write the answer and type and send me everybody. B silent mono basic acid.

[00:04:40]Yes. Everything is getting registered.

[00:04:45]Just write your name once. That's it.

[00:04:48]Mono basic acid.

[00:04:58]Don't say it.

[00:05:05]>> Monobasic acid.

[00:05:09]Yes. Aome I want answer.

[00:05:16]Monobasic acid and mono acidic base.

[00:05:21]Mono means single. D means double. Try means triple.

[00:05:26]Now monobasic acid one example can you give me I'm asking for one simple example from you thank you Deepika absolute arome absolute shmati so girls gang super congratulations you are correct so now boys please understand this monasic acid means HCl mono acidic base Again and again again again many times I had discussion mono acidic base mono acidic base is Na O di acidic base Ca O twice di acidic base Ca O twice mono acidic base.

[00:06:23]So like these type examples are there which will help you to go with and you know what these H+ and O minus when they will be joining together they will be making what bit H2O molecule. After that we learned the preparation preparation of acid and preparation of base. All the metals are basic in nature. Bes am I true or false?

[00:06:49]All the metals are basic in nature. Am I true or false?

[00:06:56]Metals are basic in nature. Am I true or false? Mitan correct?

[00:07:05]Okay. So here one student has given an answer that my statement is false. All the metals are basic in nature. This is statement he is telling false. Okay.

[00:07:19]Then online they are not agreeing with your fact. Only one person said yes but other people they telling that you are wrong.

[00:07:31]Metals whenever we are talking about they are basic in nature. This is statement is absolutely correct. Metal oxide. Yes absolutely correct. Bala Shanmati. So you please aroma. Metals are basic and when metal react with oxygen it will make basic oxides.

[00:07:52]Understood? So the base or basic oxides the metals are always considered as a basic base base. The metals are considered as base basic oxide. Now here we are going to talk about first we talked about preparation and in that preparation first preparation like the way we have done in acid same way we are going to do in base dishna good evening everybody please check your live button is on or off otherwise it very difficult to for us to analyze that you people are there or not if button will be off it will not be red color means I will to track you out. Okay? Then you will be marked absent only.

[00:08:40]So listen everybody. So you need to understand yes camera is blur.

[00:08:49]Metal oxide is basic metal oxides non-metal oxides are acidic metal oxides are basic. Now bet we talked about preparation first though we learned that whenever any metal react with water specifically you know that calcium is there sodium is there understand potassium is there they will vigorously react with water and they will make basic oxides because when we talk about calcium potassium sodium they all are metals they all are metals they are coming from metal family alkaly alkaline earth metals understand alkaly or alkaline earth metal s1 block and s2 block of periodic table. If you will see the blocks of the periodic table you see first and second understood group. So that will be exactly having so 1 2 3 whatever will be present they will be strong acids understood or not or strong base.

[00:09:57]They will be base. Understood? Metals are basic or acidic.

[00:10:03]>> Metals are basic or acidic? Basic.

[00:10:06]again. So now beta here can we check reaction? So I will tell you to write today I'm taking you brain test today.

[00:10:13]Today is a surprise brain test for you for 15 minutes. This 15 minutes brain test will be I will show you one incident and after that I will tell you to do it as the same how it is written.

[00:10:24]Understood? So offline children and online children this tracking is for all of you. So are you ready? Take out your note everyone. So here the first reaction any reaction I can give you anything I will give you and I'll check your memory level because until unless your memory level is sharp you won't be able to write in exam correct answers okay so better first reaction please write down your reactions calcium solid water liquid please see nicely calcium hydroxide aquas and hydrogen gas so please see every status very properly understood the states solid liquid aquous gas. Understood? This is the first reaction. No matter today, Sunday we are free. We can give proper time acid and basis. Understood? So now please understand this one. Now this content is ready. Next is potassium.

[00:11:17]Potassium is solid. Calcium also we have taken solid reacted with water two and here KO and water hydrogen gas is released. So this is by action of water on reactive metals. Did you saw the reactant? Did you saw the procedure? In that procedure, one thing you can see that they have released hydrogen gas.

[00:11:38]When metal react with water, what is the status? They are releasing hydrogen gas.

[00:11:44]What they are releasing beta? They are releasing hydrogen gas. So here one very important point is to be discussed. The first point is I discussed that preparation of base. Preparation of acid we have already discussed. Now preparation of base we had discussion about metals. Metals are basic in nature. So I talked about alkaline and alkaline earth metal. In that I had discussed that when a metal react with water what it will release beta hydroxide calcium hydroxide potassium hydroxide unders sodium hydroxide along with release of hydrogen gas. along with release of what gas along with release of hydrogen gas.

[00:12:28]Okay. Second reaction. Please are you seeing the reactivity status on the spot? You have to come and write on board. You can't miss because today I'm framing your brain. I just want to see how sharp your understanding skill is.

[00:12:43]Okay. Are you all ready?

[00:12:45]Next is online children also. You be ready because I will tell you to type on the spot and on the spot you have to type 1111 incident. Okay. So all of you get ready please. We will mark your numbers. So by the action of water on metallic oxide. I talked about metal.

[00:13:02]Metals are basic in nature. Metallic oxide means metal reacted with oxygen is called as metallic oxide. Like sodium oxide. Understood better. So sodium oxide when react with water sodium hydroxide is obtained. Easy. Next is calcium oxide when react with water calcium hydroxide is obtained. Here you might have seen ma'am you are late. Okay you might have seen 13 minutes 26 seconds late. So here you might have seen another important thing that solid, liquid and aquis. Solid, liquid and aquas. There also metal was solid, water was liquid. Whatever base is obtained it is aquas and hydrogen gas was released.

[00:13:45]Understood? So everything please be accountable with your answers.

[00:13:49]Understood? First preparation metal with water. Second is metal oxide with water.

[00:13:54]Understood? In both the reaction what is common is water reacting with metals. Metals and metals oxide. Our mean content is metal and metal oxide. And what is the acting with metal and metal oxide? Water. Very good.

[00:14:09]So I hope reactions everybody can write on the brain. Sorry on the in the frame you have to keep inside because anywhere I will ask one question from you and you have to come and present it very properly. So get ready for the presentation.

[00:14:33]Voice is audible for others. Please kindly check one time.

[00:14:45]Yes, some network network problem is there. Network problem is there for some uh audible just try to adjust for one day because today Sunday ready everyone third reaction by double displacement.

[00:15:07]In double displacement reaction we have seen one thing salt and base it will give another salt and another base. Salt and base it will give another salt and another base. Same type reaction. Same type reaction. It was with acid also. A different acid obtained with when it is reacted with salt. Understood. So we have done pineal. Are you ready?

[00:15:34]Everyone ready? So can you check here aluminium chloride when react with sodium hydroxide it is giving another salt. This is a salt reacting with a base. Another salt is sodium chloride and aluminium hydroxide is obtained as a PPT. Understood. The arrow down indication is that one PPT is obtained.

[00:15:55]I hope you might have understood. So in double displacement reaction listen very carefully. In double displacement reaction PPT formation is there. What is the PP here? Aluminium hydroxide. And one thing is aluminium hydroxide an alkali or only a base is alkaly or a base. Everybody listen very carefully. Aluminium hydroxide is not alkaly because it is soluble.

[00:16:25]Understood? The one which is insoluble is only considered as base. But it will not be alkaline. What is the meaning of alkaline? Alkalies are that type of base which are soluble in water. Understood?

[00:16:39]So alkalies are that type of base which are soluble in water. I hope everybody see aluminium chloride reaction. It was aquas this is also and then NaCCl and Al3 whole thric. Alth please precipitation obtained is there.

[00:16:59]Next is metal reacting with oxygen.

[00:17:02]Metal reacting with previous was metal reacting with water. But here lithium is reactive with oxygen and lithium oxide is obtained. Lithium oxide is obtained.

[00:17:13]Yes. Mran absolute. Lithium liita present. Okay. Lithium oxide is obtained. What is obtained here is lithium oxide. Lithium oxide. When metal react with oxygen, please remember when metal react with oxygen. Today is a play day Sunday. We can do as much as possible. Okay, Mr. Ready.

[00:17:52]Okay.

[00:17:54]My first framing I'm doing with Bala.

[00:18:03]Bala. First you say hi to me then I will start.

[00:18:10]Boys you see for online children.

[00:18:13]Methan is ready but Bala is not responding to me.

[00:18:22]Yes Bala your question is your question is listen carefully everyone listen the question if you know miss raise your hand but first I will be accepting her answer I will not give you any chance Bala because your answer should be very quick and Fasting.

[00:18:52]Question is degree of dissociation is only for acid or acid base both.

[00:19:06]Air offline children has raised hand.

[00:19:08]Degree of dissociation is only for acid or acid and base both.

[00:19:14]Here many people have raised hand.

[00:19:18]Shmati has raised hand but Bala your time is going.

[00:19:26]Yeah you can raise hand. No problem.

[00:19:28]Here all of them have raised hand. Bala.

[00:19:31]1 2 3 4 >> Okay fine from here I want to ask from for both so degree of dissociation is for both acid and base she's also correct okay next question goes to bhes fish.

[00:20:04]>> Very well.

[00:20:19]Metal oxide reacting with water. One example.

[00:20:27]Very good everyone. Metal oxide reacting with water. You should be writing the state and everything. Very paka. You should write your time is only 1 minute.

[00:20:37]Very good. Let's let him write first.

[00:21:19]Okay, fine.

[00:21:35]Okay, because of network issues it is might be stuck with I'm closing all applications just net I'm keeping Open.

[00:21:54]Yeah, it will not start now.

[00:21:58]Is the answer correct?

[00:22:01]I believe this is not correct. I am also saying it is not correct. I'm also saying it is not correct. Who will rectify this? Na2o is correct. Yes. H2 is correct. Yes. Then cross multiplication if we will write then what it will become?

[00:22:18]N A >> O plus.

[00:22:27]>> Very good. So here now let's balance it.

[00:22:31]2 NA 2 NA O2 H2 answer is absolutely correct. Okay. So this is called as brain bluffing when you need to just one time frame the answer and remember it. So he failed the remember test. Bes again one more time I asked from you don't fail the test that time. Okay are you all ready? 2 N is absolutely correct everybody. Are you ready for the next part? Okay. So we had done about metal reacting with oxygen.

[00:23:02]Metal reacting with oxygen.

[00:23:06]So the next one metal reacting with oxygen and Sham is coming for doing metal reacting with oxygen.

[00:23:15]Metal reacting with oxygen. Test will fail if you will not be able. Metal reacting with oxygen.

[00:23:24]Okay. Online children you can type and send metal reacting with oxygen. Enough. Let him write metal reacting with oxygen.

[00:23:56]In between you come here and dance.

[00:24:02]Okay. One answer I got from Mitan. Yes.

[00:24:06]Zinc reacting with oxygen two. Two will be there. Balancing is needed.

[00:24:12]Okay. Balancing is needed. Here it is not striking. I don't know why balancing is needed.

[00:24:30]That's not that's root method. But yes m it's absolutely correct. Now we will talk about because now I it more complex. Now in between I took one test you forgot the previous section another test get ready because now mistake will become very heavy. Now look here when by action of oxygen and metal sulfide.

[00:24:50]Metal sulfide means Zns. So ZNS reacting with oxygen zinc oxide and sulfur dioxide. Write down because if you will write you will remember. Understood?

[00:25:02]Metal oxide. What is the metal oxide?

[00:25:05]Metal sulfide. Metal oxide. Metal sulfide they react.

[00:25:13]Metal sulfide and metal oxide. So here metal sulfide when react with oxygen.

[00:25:20]Metal sulfide when react with oxygen.

[00:25:23]One time close your eyes and remember the frame please. Metal oxide when react with oxygen, metalide when react with oxygen.

[00:25:35]Understood? So metal oxide react with oxygen. Not possible because already metal oxide is there. Understood? Metal oxide react with water is there. H metal sulfide react with oxygen is possible.

[00:25:50]Metal sulfide metal oxide react with oxygen possible. No already it is metal oxide already reacted correct now. So metal oxide will react with water metal sulfide will react with oxygen. So when metal sulfide is reacting with oxygen zinc oxide and sulfur dioxide is obtained. What is obtained? Zinc oxide and sulfur dioxide. By decomposition of salt copper carbonate it will give copper oxide and carbon dioxide. By decomposition of salt like Mgo3 is also a salt. First for that you remember Cu3 is salt. Mg3 is also salt. Cu3 is salt.

[00:26:35]Mg3 is salt. I will ask >> mg3 is also a salt. Cu3 for maths also you'll have same framing today. Mg3 and Cu3 both are salt and they will be exactly having decomposition then they will give copper oxide and magnesium oxide and you know that copper oxide is a base. Magnesium oxide is also a base.

[00:27:04]So this is preparation of base. Zinc sulfide will when react with oxygen gives a base. Salt when decomposed will gives a base. But what type of decomposition? Thermal decomposition heating bitter. What we are doing here is we are heating it. What we are doing here is heating it.

[00:27:25]Delta is the sign of heat. Now on heating metallic nitrates. This I don't want you to do. Okay. Metallic nitrates.

[00:27:34]Now we will talk about soluble bases like sodium hydroxide and ammonium hydroxide can be formed by slackid line.

[00:27:43]Understood this. Please note down one time.

[00:27:46]This is an important note like when somebody will be asking you soluble bases which type of soluble base we are talking about beta we are talking about sol soluble bases like sodium hydroxide and ammonium hydroxide. Sodium hydroxide and ammonium hydroxide we can form it by slack lime and what is slack lime here is calcium hydroxide.

[00:28:11]understood ammonia.

[00:28:17]So slack lime we can make sodium hydroxide and from ammonia we can make ammonium hydroxide.

[00:28:28]Please note down because anytime I can ask this question.

[00:29:19]Exit out and again one time go inside because network is little unstable. Ba Sundays now uh there this net is not working. I think boredom I have to change. Someone played disturbed it. Now look here. So ammonium and water it will become ammonium hydroxide.

[00:29:38]talk about basic stupidity color change indicator test. Okay. So preparation of base we learn now we can prepare base from metal. We can prepare from metal oxide. We can prepare base with metal reaction with oxygen. We can prepare metal with metal sulfide reacting with oxygen. Correct? We can make base when salt and base react with each other.

[00:30:04]Double displacement reaction. We can make base when acid is burned means thermal decomposition. Understood? Like Mg3, Ca3. After that again we have learned last part that we can make base.

[00:30:18]How we can make base when calcium carbonate react with calcium hydroxide or ammonia react with water. So now this was about the base. Now we are going to talk about the physical properties.

[00:30:32]Understood that was preparation. First stage what we covered about base was preparation. It was preparation.

[00:30:45]Okay, I'm trying to reconnect one more time.

[00:30:59]Anybody's having mobile network is good there. mobile network.

[00:31:18]Now it is okay.

[00:31:23]Now it is okay. Can you check? Now it is okay.

[00:31:29]Now net is okay.

[00:31:31]Yes. Okay, in between you inform me. Now please pay attention here. Litmas solution. You know that it will turn red litmus paper blue. We have done that day. Now B R B and AB R acid turns blue litmas paper red. Base turns red litmas paper blue. B RB. So this we know methile orange it will color orange to yellow. Pinoptylene test it will convert it into pink. But acid will give phopillene test it will remain colorless. It will remain colorless. But the moment base is added. Yes. But the moment base is added it will become what bita it will be pink in color. What is the color? It is giving pink color.

[00:32:21]Shmati done everybody. I hope you might have understood. Now they're good electrolyte. Understand one thing. Salt, acid, base all are good electrolyte because the moment they are added in water they will dissociate into ions and you know that ions are conducting current. Who is conducting current?

[00:32:39]Ions. We need free electrons for conduction of current. So ions are responsible for conduction of current and they are allowing it. They have corrosive nature. Yes, they have corrosive nature. Now we are going to talk about reaction with acids. Now chemical reactions chemical property we are starting. So when we are starting chemical properties first important point to be noted here is the base react with acid salt and water. This is called as what reaction? Neutralization reaction. So sodium hydroxide when react with acid it will give salt and water.

[00:33:17]Okay. Next is these reactions are exactly producing salt and water. Till here it is everybody understood reaction with metals always I said that the metals are basic correct now but some metals are empoteric. What is the meaning of empoteric?

[00:33:38]What is the meaning of empoteric?

[00:34:05]I was talking about some battles are empoteric.

[00:34:09]What is the meaning of empoteric? Okay.

[00:34:12]Hashid, can you explain me what is the meaning of empoteric?

[00:34:19]Okay, anyone who can explain me what is the meaning of empoteric online children because see empotic means when they are with base they will react as acid when they are with acid they will react as base so they are called as empoteric a m p h o t e r i c empotic yes substance which are both acidic and base so here when I'm talking about zinc can you check zinc is Metal we already know. So metals are usually basic in nature. Come on. So how can a base react with base?

[00:34:52]Correct. Now but when you see here sodium hydroxide when react with zinc it is giving sodium zincate plus hydrogen.

[00:35:01]Sodium zincate reaction. It's a very important NCRT reaction. It is please note down this one. Sodium zincate reaction. Everyone practice. Hit note down. So this is sodium hydroxide when it reacts with again and again.

[00:35:16]Aluminium is correct only beta they are empoteric. Zinc aluminium they are empoteric. Okay they are empoteric. Zinc aluminium they are empoteric. Wait I'm checking.

[00:35:39]I hope network is okay now.

[00:35:46]Ah you are late so you are sorry. Very good.

[00:36:09]Yes, all are there. Empoteric means >> when it is with base, it will act as acid and when it is with acid, it will act as base. So they are examples of empoteric.

[00:36:33]One time again I shifted and checked.

[00:36:35]Okay. So now zinc, aluminium there examples of got empoteric. Understood.

[00:36:40]Zinc, aluminium, lead there examples of empoteric. So now we will be going with another one. Yes. So now here can you check zinc? It is already base. Metal means base. So here it will act as acid.

[00:36:54]Now it is making what? Beta? Sodium zincate and release of hydrogen. I hope you might have understood this one. So now preparation sorry precipitation of hydroxide precipitation of hydroxide means aqua solution of alkali precipitate insoluble hydroxide. What type of hydroxide beta insoluble hydroxide means they are bases but they are not alkalies. They are bases but they are not alkalies. So who is releasing aqua solution of alkali? Aqua solution of alkali means yes aqua solution of alkali precipitate insoluble hydroxide of heavy metal from the solution of their salt like copper, zinc and iron. Please underline this and note down in your because it is insoluble.

[00:37:43]First one is soluble and then it is giving you insoluble. So please remember this part and please write down this one very slowly. I'm explaining one more time. Aqua solution of alkali and you know that alkalies are what basic in nature which are soluble in water.

[00:38:01]Understood? So aqua solution of alkalies precipitates insoluble hydroxide. What it is precipitating insoluble hydroxide of heavy metals from the solution of their salt like copper, zinc and iron.

[00:38:18]Understood? Can we check copper sulfate when they react with a base? What it is releasing? Copper hydroxide. It is insoluble. Beta insoluble. And copper is a heavy metal. It is coming from D block. From where? It is coming beta D block. D block are consisting of heavy metals. D blocks are exactly having what beta heavy metals. D blocks are heavy metal. Hi beta. So heavy metals. So you need to understand this that it will be releasing heavy metal. So copper sulfate when they react with base copper sulfate reacted with base then you will be getting copper hydroxide which is pale blue color it is precipitated are you understanding? So it will become insoluble and then sodium sulfate is obtained. So this is preparation of hydroxides. For preparation of hydroxides what we are using base we are using for preparation of hydroxides and where insoluble metals you are getting of heavy metals.

[00:39:22]See copper what? Copper hydroxide is a heavy metal. Copper is a heavy metal. It is belonging to which group? D block elements. So only they are called as heavy metals. Transition heavy metals.

[00:39:35]Understood? I hope everybody understood this one. Can we go back to the next part please? Hm. Now we will talk about again zinc sulfate and then sodium hydroxide. Again it is coming zinc hydroxide that is galatinous white PPD.

[00:39:50]These are PPD for Can you go for it please? Again it is a type of double displacement.

[00:39:57]Come on note down this one.

[00:40:03]So what we have learned zinc sulfate when react with sodium hydroxide. This is preparation of what? with a hydroxides preparation of hydroxides. So here two hydroxides we have obtained and these hydroxides are bases but not alkalies understood because they are insoluble in water. So they are mere bases like copper sulfate when they react with sodium hydroxide it is making copper hydroxide which is a base but it is insoluble. It is not alkaly. But here beta this is alkaly soluble but this is alkaly which is this is a base which is not soluble. Here also if you will see zinc sulfate when react with alkali NaOH is alkaly only. Now what they are giving hydrogen what do you call zinc hydroxide which is exactly a white PP insoluble base. Insoluble base. Did you noted the reactions? Now we will go for one very important point. The hydroxide of zinc, aluminium and lead being empoteric.

[00:41:04]I said my case what they are beta empoteric in nature dissolve in excess of sodium hydroxide and potassium hydroxide. Note down in in board exam they are most important part. Board exam hits with these cases. They will tell you to identify which reaction is ampotary.

[00:41:25]That time it will become difficult for you. They'll not give you straightforward reactions. children so only I'm telling them to prepare that side of reactions where you can keep on getting twisted questions can you get the first twisted question precipitation of hydroxide in precipitation of hydroxide what we learned we are using what alkalies understood alkaly reacting with copper sulfate or zinc sulfate what we are getting >> insol soluble base. Are you understanding what you are getting?

[00:42:02]Insoluble base of what? Heavy metals.

[00:42:05]Insoluble base of heavy metals.

[00:42:07]Understood? Because zinc also belongs to D block element and your copper also belongs to D block element. Now which and all are empoteric?

[00:42:18]Aluminium, zinc, lead. Understood? Means they behave as acid in presence of base, base in presence of acid. They will ask this question beta. They will ask this question. See zinc, aluminium and lead.

[00:42:33]So beta they will be acting as a when they are they are NOH is already base.

[00:42:40]NaOH is already base by default. You understand? Zinc is metal. It is basic.

[00:42:47]Aluminium is metal. Basic. Lead is metal. Basic. So they should react with acid.

[00:42:55]They should react with acid. But being basic, they are reacting with base. That means are they are they now base or acid?

[00:43:06]Acid. Because excess of NaOH is there.

[00:43:09]So excess of NO is base. Now in front of base how they are reacting? Acid. Did you understood? So only they are called as what? Emperoric. And can you name empoteric metals please? Again please name empoteric metals.

[00:43:27]Again empoteric metals >> lead maximum three they will give more than this are there but they will not give for your exam they will be giving.

[00:43:38]Yes absolutely correct children please keep writing and keep giving me the solutions. Yes. So lead aluminium and zinc. How is the class? You are learning nicely. Hm. So better they are acting as these metals are usually base but in presence of base they start dissolving in base they start acting as acid and because of changing their behavior what they are called as empoteric understood.

[00:44:02]So empoteric now sodium zincate reaction see underlined reaction please please please please please sodium zincate reaction is present in your NCRT book also don't leave this part zinc hydroxide when react with sodium hydroxide in excess it will start reacting becoming like an acid acid base reaction it will become a neutralization reaction what it will become neutralization reaction and because of what beta empoteric behaviors Superceller because of amphoteric behavior. Well done. So this is exactly excess of non-metal. So non-metal is already what? Beta non-metals are acidic. Acid base reaction.

[00:44:44]Neutralization reaction. Please write down these three reactions. Magnesium hydroxide is base. Sulfur is non-metal.

[00:44:52]Nonmetals are acid. Gas is formed. Okay.

[00:44:56]So salt and water is obtained. Note down the reactions. Salt and water formation is there.

[00:45:46]now. Network is okay. Better. It is buffering for me.

[00:46:45]Did you notice it?

[00:46:51]Wow.

[00:47:21]Okay. Shall we go back to class please?

[00:47:24]Now listen better. So if non-metallic oxide react with metallic hydroxide which is based to produce salt and water. So that's the conclusion what we have seen reaction with ammonium salt that's not that much needed but sodium zinc is an important one we did that much. Okay. Now we will go for uses of base sodium hydroxide where and all it is used. So formation is a well-known use. After that textile industry, paper and medicine industry it is used. Next in refining of petroleum ammonium hydroxide it is used as a reagent in laboratories in fertilizers ray and plastic making cement bleaching powder washing unders this is for calcium hydroxide and potassium hydroxide it is used in again salt and soap formation in batteries also it is used alum aluminium hydroxide in foaming agent in fire extinguisher you might have seen fire extinguisher now so there what is ammonium hydroxide is used. I hope you might have understood.

[00:48:27]Next one is magnesium hydroxide.

[00:48:30]Magnesium hydroxide it is antacid.

[00:48:33]Everybody knows it. We have already discussed about it. Calcium oxide as a drying agent and basic flux in metal extraction also.

[00:48:43]So we just read it out.

[00:48:46]We will go for activities of acid and base. Ready for it? Take a break of five minutes and then we will start.

[00:48:56]Yes, it's a recorded maths. I will start in between break we will start maths again we will start science. Okay. So now it's time five minutes break you take. After that we will start maths children. Yes it's a recorded one.

[00:49:09]Get ready. Five minutes break. Only five minutes after that we'll start.