NECO 2026 Chemistry Questions & Answers 100%

[00:00:00]The quarter density's exam is coming to an end. In fact, you shouldn't have tried. Starting from JAM to WAEC, now to NECO. Well, NECO is coming to an end.

[00:00:08]Congratulations to you guys, and I wish you best of luck. Even me myself, I've tried for you people. Like I've really, really tried for you guys. Uploading videos back-to-back. Starting from JAM from JAM, WAEC, from WAEC, NECO. In fact, check my channel. I've uploaded a lot of videos for students back-to-back from JAM to WAEC to NECO. The But, tell me thank you.

[00:00:31]I deserve thank you from you guys. I do I really, really deserve thank you from you students. So, this is another class again for NECO chemistry. As you have been doing it before, you all know what to do. You all know what we You students know what we are doing here, so I don't need to talk too much.

[00:00:43]Now, let's go to the solution to these questions I have here.

[00:00:46]Um, okay.

[00:00:48]Okay. Now, solution. Let me use my black marker, my black pen rather.

[00:00:53]So, solution.

[00:00:58]All right. So, the question is here already in front of you. I believe that you can see my screen very well. So, read it up and let me just solve it. So, um the concentration of A of this guy of this salt, this Mg. This is a This This is a What type of salt is this? This is a double salt, yeah. Double salt because it has water of crystallization.

[00:01:17]Yeah. So, it's an hydrated salt. So, concentration of this in mol per dm cube is 0.75 molarity or mol per dm cube, anyone you call it. So, and um the concentration in gram per dm cube of this Oh, I'm using A for it. I just like using A. You understand?

[00:01:35]But, okay, let me just write conc.

[00:01:38]Conc in mol.

[00:01:39]Sorry. Let me just write conc in mol.

[00:01:42]Cuz I don't want to put A.

[00:01:44]Conc in mol per dm cube is this. While conc in gram per dm cube So, that one is um 184.5 gram per dm cube. So, I was asked to look for the value of X.

[00:01:58]So, for me to look for the value of X, then that is going to be um conc in mole per dm cube is equals to conc in gram per dm cube over molar mass.

[00:02:14]Can you see that?

[00:02:16]Molar mass, so I will make my molar mass the better formula. So, molar mass will be molar mass will be um that will be conc in gram per dm cube over conc in mole per dm cube.

[00:02:33]Can you see that?

[00:02:34]So, what is my conc in gram per dm cube?

[00:02:36]That is um 184.5 over 0.75.

[00:02:42]Yeah. So, calculator. So, 180 184.5 then um divided by 0.75.

[00:02:53]Yeah.

[00:02:54]0.75 So, that's giving me 246, right? Yeah, 246.

[00:03:00]So, that's giving me 246 g per mole.

[00:03:03]246 g per mole So, from there, I can now say um okay, then I can say Mg MgSO4.xH2O, that's equals to molar mass, right?

[00:03:22]So, the molar mass is 246.

[00:03:25]Magnesium Magnesium is um 20 Is that not 23?

[00:03:29]Yeah, magnesium is 23. I mean the relative atomic mass. So, that will be 23. And then sulfur is um 16.

[00:03:38]Sorry, sulfur is um 32.

[00:03:40]Sulfur is 32. So, 32 plus um this guy here This oxygen is 16. So, 16 * 4 plus X Water is 18, so I don't need to work that because 16 + 2 is 18 plus X plus X into bracket multiplied by H2 multiplied by 18.

[00:04:06]I don't need to show that water because this is just 2 plus 16 and that is basically 18. So, magnesium is 23, sulfur is 32. So, this is the [clears throat] yeah. So, let's do the calculation together.

[00:04:20]You can also use your calculator to use cross-check. That will be going to be 23.

[00:04:25]Okay, let me do 16 * 4 first. 16 * 4 that's 64. 64 + 32 plus 23 that's 119.

[00:04:39]So, 119 plus this this X here now the value for this X now, you are going to multiply it with the 18 now. Take note. So, that will be 18 X equals to 246. By the time you look for the LCM, that's how you you call it like that. That will be 18 X equals to 246 minus 119.

[00:05:01]So, X will be equal to 246 minus 119 is what?

[00:05:09]246 minus 119 that's 127.

[00:05:16]So, 127 over 18 and X will be equal to So, divided by 18 7.0 7.055556. [snorts] So, approximately 7.

[00:05:31]So, X will be equal to 7 like that. You know, 7.055556.

[00:05:38]By the time you approximate, X is 7.

[00:05:40]Yeah.

[00:05:41]Yeah, I think magnesium is 23. Though, they're supposed to give you the relative atomic mass for everything at the at the bottom of each questions.

[00:05:50]So, anything they give you, use it.

[00:05:53]Oh.

[00:05:55]I think sodium is 23.

[00:05:57]So, magnesium should is not 23. Sodium is 23.

[00:06:01]Sulfur is 32. I'm sure of that.

[00:06:05]Magnesium should be um I think magnesium is 20 Let me check. I think magnesium is 24.

[00:06:14]Magnesium should be 24.

[00:06:17]It should be 24. So, 24. So, this should be 120.

[00:06:21]Magnesium should be 24. So, not 23.

[00:06:25]Though though in the question you'll be given at the below at the bottom of the each questions. So, this is this should be 120.

[00:06:34]And by the time you subtract, this should be 128.

[00:06:40]Yeah. 128. So, let me re-divide again to check. So, uh that'll be No, sorry. 120 minus that is 126.

[00:06:52]You know, it's reducible by one. 126.

[00:06:55]Okay. So, by the time we divide, 120 divided by 18.

[00:07:00]Oh, that's giving us seven on dots.

[00:07:03]Yeah, seven on dots. So, no need to approximate.

[00:07:06]It is seven sharp.

[00:07:08]You get to that seven. All right. So, that's that about question number one.

[00:07:11]Now, let's move to question number two.

[00:07:13]Before we move to question number two, um the highest views I've had in my videos that are on YouTube is the highest views is um 40,000 plus. I think so. Yeah. I've never gained 50,000 views on this YouTube before.

[00:07:30]Checking my videos. But, I think on TikTok I've gotten like 248,000 views.

[00:07:36]248,000 views should be my highest views on TikTok. So, please student on YouTube, I'm pleading. Please help me to push this video. Let me hit 50,000 views at least my first time of hitting 50,000 views. The data comes from this video. Please I'm begging.

[00:07:51]Please.

[00:07:53]And I believe that with your help it can be done. Yeah. By reposting this video massively, by sharing it to your friends massively. At least 1 million students write 1 1.2 million yeah. Write NECO every year. 1.2 sometimes 1.5.

[00:08:07]Yeah. So please at least if I can see 50,000 students watching this video with your help by reposting massively it's going to go a long way to me. I've never hit 50,000 views on YouTube before in the in the views rather. But I've hit 40,000 plus. Yeah. But TikTok TikTok students thank you so much. Please keep the energy alive. 246 view 246,000 views. We can still make it in this video. Thank you. All right. So let's go to question number two.

[00:08:35]Now this is question number two here.

[00:08:37]Question number two here says that we should calculate the mass of this guy.

[00:08:41]So checking this this question what formula can we use?

[00:08:45]We're going to use our molarity.

[00:08:49]Molarity or solubility any one of the two. Molarity is equal to mass over molar mass times 1,000 over volume.

[00:09:01]Either I call it molarity or you call it concentration you can even call it solubility. Any one of the thing you're using you're you're good to go. So that will be 0.10 mol/dm³ The mass is what? Okay, I'm looking for the mass. Let me use that X. The molar mass is 106 times 1,000 over the volume is 250.

[00:09:24]So let's do the division. That will be 0.10 is equal to it's going to be Okay.

[00:09:29]I think 250 here one 250 here four.

[00:09:32]Yeah.

[00:09:34]So 250 there one 250 there four. So I know that I can even cut I can even cut from here instead of going through a longer stress. So, I think four should go in 106. So, if four is good okay, this is going to have a remainder. If that be the case, let me just go straight like that. That will be 4x over 106 so over one. I cross multiply, then 4x equals to 106 * 0.1 zero. So, x will be equals to 106 * 0.10 over four. And finally, I should be getting 106 * 0.10.

[00:10:16]So, divided by four. And that's giving me x is giving me 2.65 g.

[00:10:26]So, you can you can cross-check you know, with your calculator. So, 2.65 g.

[00:10:31]That's the answer for this. Now, before I proceed, your NECO chemistry question used to come in this format. You have to answer four questions out of I think six or seven.

[00:10:43]Seven. It's seven. Either six or seven.

[00:10:46]You have to answer four questions out of maybe six or seven. So, each question used to carry 25 25 marks.

[00:10:54]Each question used to carry 25 25 marks.

[00:10:57]So, that's how the question used to be structured. And the total of the theory makes 100 marks. 100 marks in theory.

[00:11:05]Your objective, you have known that NECO used to set 60 questions for the objectives. That one is standby.

[00:11:11]So, this 100 marks plus 60, that makes it 160 marks. Then they will convert it to 50.

[00:11:18]Your practical 50 mark is standby.

[00:11:21]When I say standby, they are not converting your practical at all.

[00:11:26]At all. I recently marked a student practical question from Igboya.

[00:11:31]Forgotten this the name of school. So, because I mark WAEC and NECO. I'm I'm writing to WAEC, not NECO.

[00:11:37]So, I mark the practical. WAEC marking, I mean, NECO marking has not started at all. It's WAEC marking that is going on currently.

[00:11:43]All right. So, that's how the question is. Prepare for four Answer four questions out of seven. So, each question carry 25 25 marks. Although, NECO question Even NECO and WAEC say their prac- their chemistry question used to have sub like 1 A I, 1 A II, 1 A III, 1 A IV. Something like that. So, that's how the question is. If you have more questions, the comment section is always open, so I can answer all your questions. Good.

[00:12:08]Now, let me move to question number three.

[00:12:11]So, question number three says that we should give one differences difference between strong acid and weak acid. So, that's the A. So, let me tabulate. Now, strong acid and weak acid. When I was in undergraduate, I mean, my university days, so my project topic happens to be misconception of mis- student misconception between acid strength and acid concentration.

[00:12:35]And when I'm talking about acid strength, that means you are talking about strong acid and weak acid. So, these two terminology, they are acid strengths.

[00:12:43]So, these happen to be my project topic when I was in my undergrad in my university days in University of Ibadan.

[00:12:49]All right.

[00:12:51]So, one one of the difference is that strong acid ionizes completely in water.

[00:12:58]Ionizes completely in water.

[00:13:04]While weak acid ionizes partially.

[00:13:08]So, ionizes partially in water.

[00:13:14]Now, let me add example. Strong acid, H2SO4, HCl, HNO3.

[00:13:22]Those are the common strong acid. Weak acid, CH3COOH, H2 Okay. I'm Okay, H H2 X03 Yeah, H2SO3 H H Okay, around H3L this going to be HBR Sorry, HI HI HI Part of here we have HBR we have HBR we have this part of here. You have You have HF rather not HI HF I'm trying to list all the halogens, you understand? So, do this HF is that the reason why it is weak acid. HCL HBR and HI they are under this space, but HF is an ion. It has a reason to do but it's not today. I will explain that later.

[00:14:11]So, and so and some and some other ones too and some other ones. So, they are weak acid.

[00:14:16]Good. Now, let's move to question number five.

[00:14:19]Sorry, question number four rather.

[00:14:21]Question number four.

[00:14:22]Before I move to question number four, please be aware that our masterclass for this chemistry NECO chemistry questions and answers powerful masterclass is coming up on Monday by 9:00 in the night. 9:00 p.m. on Monday chemistry powerful masterclass. We are using Zoom workplace as usual. So, the price is still 1,000 naira is not changing. It does not depend It has not changed. Students have been paying since last week yeah, since last week. So, 1,000 naira. So, if you are interested to join the powerful NECO 2026 chemistry masterclass 1,000 naira.

[00:15:00]So, get started, make your payment to this account number 8068435809. So, the account is Paycom.

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[00:15:13]So, once you make a payment, send your receipt to this WhatsApp number 09155102818.

[00:15:20]So, we are starting the class 10, 9:00 p.m.

[00:15:24]9:00 p.m. in the night. So once you make your payment first, then send your receipt to this WhatsApp number, then write another the caption that this for chemistry NECO 2026 chemistry master class. Once you have done that, go to your Play Store App Store to download Zoom Workplace. So once you have downloaded Zoom Workplace there, sign up on the Zoom Workplace and we shall meet in the class. Don't forget that even I don't need to talk too much most of my master class they have been stopped much.

[00:15:51]So reviews will be coming in the comment section, I'm sure of that. Reviews will choke in the comment section. I don't want to talk much about it. So write the possible structural isomers of chlorobutane. Firstly, structural isomerism I don't want to talk too much. We have type of isomerism, structural, geometrical, optical, stereo and some other ones too.

[00:16:13]So possible structural isomers for chlorobutane. Chlorobutane is C 1 2 3 4.

[00:16:18]So um we have your C 3 we have 1 H here, 1 H here, 1 H here, 1 H here.

[00:16:25]H here, H here and Cl. So this particular one, let me use this book.

[00:16:30]This particular one is 1-chlorobutane.

[00:16:34]butane.

[00:16:36]So the molecular formula for it is C4H3456789 H9Cl.

[00:16:44]This is the molecular formula for chlorobutane.

[00:16:46]So the structural formula, this is the main one. So from there, reduce this one to still to four rather. Put this chlorine here. Balance the rest with hydrogen.

[00:16:56]You can do that. Balance the rest with hydrogen with hydrogen. So naming this Okay, with hydrogen. Naming this, this is 1 2, this is 2-chlorobutane.

[00:17:07]butane.

[00:17:09]I'm good. You have put this chlorine here. You have put it here. If you put it here, it still yeah, it still give you 2-chlorobutane. So you have put chlorine everywhere. You need to you are not putting chlorine in any way again.

[00:17:18]Now, the next step is to reduce the number of carbon to three. 1 2 3. So, put the fourth [clears throat] carbon here and put your chlorine here. So, in case you put your chlorine here, the name is going to be let's see.

[00:17:32]That's going to be um let's see. That'll be 1 2 3. Okay. Yeah. It can work like this because the name is going to be different. Let's balance the hydrogen.

[00:17:44]So, naming this is going to be um 1 2 1 2 3. This two methyl I mean, 1 chloro 2 methylpropane.

[00:17:56]This is going to be 1 chloro 2 methyl propane.

[00:18:05]Good. So, another one is um I've put the methyl here. 1 2 3. The methyl is here, right? Now, let me put my chlorine in the second carbon.

[00:18:16]This is Cl. So, balance the rest with hydrogen.

[00:18:20]So, this is going to be Let me just write the name. It is going to be two two chloro two methyl propane.

[00:18:34]Two chloro two methylpropane.

[00:18:36]So, that is the name for that. So, these are the four possible isomers we can see from this guy. Take note of the name.

[00:18:43]Although, you only have to write it.

[00:18:47]So, just write it down. I don't think they need the drawing. So, just the name. So, you can put it down like that.

[00:18:51]Let's proceed to question number five.

[00:18:56]Please, let's share this video, please.

[00:18:58]Guys, let's share this video.

[00:19:00]Let's share this video. It's like I'm missing something. Oh.

[00:19:03]Sorry, I missed something here in question number three.

[00:19:06]Question number three B. It said mention two properties of covalent compound.

[00:19:11]Thank God I remember now before I ended this video. So, properties of covalent compound, number one, okay.

[00:19:18]Oh, I'm not to tabulate. Sorry about that.

[00:19:21]So, let me just put it down in here.

[00:19:25]So, for that will be B, right? So, number one, they are weak >> [snorts] >> compound.

[00:19:36]And also, they are the compound The compounds are formed by the sharing of electrons.

[00:19:55]So, that's just it. So, that's just it.

[00:19:58]They are weak compounds.

[00:20:00]They are weak compounds. So, probably it's formed by a weak bond. The bond between the compounds or among the compounds are weak.

[00:20:08]So, you can put that like that. And also, they are And also, the compounds are formed by sharing of electrons. So, that's that about that. Now, moving to the last question here. They said we should just write contact process. You know, we have bunching process, we have bunching process, we have upper process. We have so many processes in chemistry. But for contact process, let's write contact process. How to prepare H2SO4 >> [clears throat] >> Yeah.

[00:20:32]How to manufacture H2SO4. So, the first one is when you have your sulfur, you react it with oxygen. So, that gives you uh that gives you SO2.

[00:20:43]Yeah.

[00:20:44]This is solid. This is a gas. And this is also a gas. So, SO2. So, if you have your SO2, you react it with excess oxygen. This is a gas. This is a gas.

[00:20:55]So, that will give you So, that will give you SO3. It's also a gas. So, you balance the reaction very well. So, two is going to be here. And also, two is going to be here. It's balanced. So, you take the SO3 here, which is a gas, you add it to acid mist.

[00:21:12]So, acid mist. If you add it into acid mist, that will give you H2S2O7.

[00:21:19]H2S2O7, this thing is called oleum.

[00:21:23]Oleum, it's called oleum. So, you are now going to add water to this oleum.

[00:21:30]You're going to add water. Like, it's not that you're going to add water, you know. This This process It happens in a machine. Like, it happens in a machine.

[00:21:38]All these big machines. So, the process is not It's a very deep process. When you If you are If you wish to study industrial chemistry in university, they will explain these things to you. The relation of H2SO4 in the industry, in ICH, that's industrial chemistry, for those who wish to study chemistry. So, when I was taught this one, they Like, when I was taught this thing in the university, the full explanation about this, I was like, "Wow, this is massive."

[00:22:02]All right, but NECO just wants us to write only the reaction out. Not the whole explanation from beginning to the end.

[00:22:08]So, H So, the this oleum added with water So, that will give you H2S2O I mean, H2SO4, rather.

[00:22:18]H2SO4.

[00:22:20]So, balancing this Balancing, you are going to put two here. Now, let's check, you know. This is two, two, four. This four, two, two.

[00:22:29]And this is eight, eight. So, it's balanced. So, you have prepared H2SO4.

[00:22:33]You have already manufactured H2SO4. So, that's what they want to hear from you.

[00:22:37]All right, I think I've answered this question here. Please, once again, share this video. I want this video to reach 50,000 views. 50,000 views. I know with your support, I know with your support, I can achieve that. I've hit that 40,000 before on this channel. I'm referring to YouTube, not TikTok. My TikTok, in fact, I've hit that 290 248,000 views on TikTok. Please, share this video to others so that they can benefit from this video. And don't forget that you have to join the master class 1,000 naira and come and learn something that will help you in your chemistry exam.

[00:23:12]The exam is coming to an end. You have been trying your best, and I'm sure that the result is going to be a success to you.

[00:23:20]A louder amen.

[00:23:22]A louder amen. A louder amen. And share this video viral. See you in class. Bye.