Commonly Repeated chemistry Questions in the 2026 jamb examination 🔥🔥🔥: score 90+ now‼️‼️

Added: 2026-05-05

[00:00:00]All right.

[00:00:01]Good day everyone.

[00:00:03]Welcome to this exciting YouTube lessons.

[00:00:07]Today, I'm going to be looking at the UTME chemistry.

[00:00:11]And the exam they are just writing in the UTME.

[00:00:17]Now, um Now, these questions questions that they tested on after them on day one, day two, and day three of the examination. And it has been a normal normally you know about the years where questions are being repeated. So, these guys have question banks.

[00:00:38]The UTME the JAMB body has a question bank. They are doing very well.

[00:00:44]They have a question bank and they don't exactly repeat the question.

[00:00:48]They repeat the question They repeat the question in that way, but like a different manner.

[00:00:55]Similar way, but like a different manner. So, that's how they normally repeat their question. So, what I will do in this video, I will not just explain the questions. I'm going to explain related So, I'm going to talk about related concepts. So, maybe this question can be asked. Like this first question here now, they ask it in so many ways.

[00:01:13]I'm going to explain all the ways they ask it and um many students have sent me so many questions.

[00:01:19]Try to answer the questions.

[00:01:22]So on and so forth. So, the first question says, "Which of the following is an amphoteric oxide?"

[00:01:31]I like to say this.

[00:01:32]Our level for now writing JAMB first. Now, amphoteric elements is what we call We use the word "biz lab" for them. So, these elements I'm going to write here biz lab.

[00:01:45]What's it called?

[00:01:47]form amphoteric oxides. So, beryllium, zinc, lat, lead. Lead, okay? B E. So, the the short code is B E Z A um Z L A T.

[00:02:05]B E Z L A T. That's biz lab. Beryllium, zinc, lead, aluminum, tin.

[00:02:10]amphoteric oxide. So, amphoteric oxide here is What's it called now? Lead oxide. And I'm going to be talking about oxides in the exam.

[00:02:19]Just all questions on oxides again. Now, quickly, um the UTME examination body can ask you, "Which of the following is an acidic oxide?" Acidic oxides are usually oxides of nonmetals. They turn blue litmus paper red. Do you get? While amphoteric oxides are oxides that can act as both acid and base. Do you get?

[00:02:36]So, another question came in the examination. They asked us, "Which of these oxides is a basic oxide or dissolve Which of the following dissolve in water to produce a base?" That's a basic oxide. Basic oxides include oxides of group one and group two elements. So, group one and group two elements such as um such as sodium.

[00:02:55]Such as N E. Such as K. Such as C E.

[00:03:00]Such as B A. So, the only group two element that is amphoteric is beryllium.

[00:03:05]Beryllium is in group two, but it's amphoteric. So, group one and group two elements their oxides are usually basic.

[00:03:11]in water and their solution turn blue red litmus paper or red litmus to blue.

[00:03:17]Do you get? That's for That's for basic oxide. While neutral oxide include C O, include water H two O, include N O, include N two O. The only oxide of nitrogen that is that is acidic is N O two. So, acidic oxide C O two, N O two, phosphorus oxide, chlorine oxide. They are all acidic oxides. This should not be forgotten. Should not forget this.

[00:03:40]Acidic oxide are the one we call acid anhydride.

[00:03:43]oxide. So, they are writing on writing on Monday, writing on Tuesday, or probably Wednesday. Please take note.

[00:03:49]Acidic oxide is what we refer to as acid anhydride. They include the highest oxidation states of the oxides of nonmetal. They are the highest oxidation states. So, we don't say carbon two. The highest oxidation state of carbon is carbon four. So, carbon four oxide is the acidic oxide. Nitrogen four oxide is one of the highest One of the highest is an acidic oxide also. So, that's N N O two. Acidic oxide. P Phosphorus oxide is acidic.

[00:04:13]In solution, they turn red They turn blue litmus to red. Do you get? So, please note that note that. This question two came up I think on I think day two or day two or day three.

[00:04:24]Now, "Which of the following decomposes on heating?" Now, please take note. They asked this question on trioxocarbonate carbonate salts. I said before. Now, trioxocarbonate salts Any salt that has C O three. Any metallic trioxocarbonate.

[00:04:36]Metallic trioxocarbonate. Metallic trioxocarbonate salts are all What's it called? They are not all stable to heat.

[00:04:43]Do you get? Only two trioxocarbonate salts are stable to heat, which is that of potassium and that of sodium.

[00:04:49]So, for our level, only trioxocarbonate salts of potassium and sodium are stable on heating. Every other trioxocarbonate salt decompose on heating. So, this one will decompose on heating because it's not that it's not that of sodium. It's not that of potassium. And calcium oxide is a compound that is very stable to heat.

[00:05:06]Calcium oxide is called quicklime. It's very stable to heat. It is used to dry ammonia in the laboratory. Calcium oxide is used to dry ammonia in the laboratory. Now, um Drying ammonia brings me to something.

[00:05:19]So, the answer to this question is B.

[00:05:20]Now, ammonia brings me to something.

[00:05:22]Now, they tested this question on HCl.

[00:05:24]If you are writing this examination, HCl. So, they tested this examination tested these questions on HCl. Now, what did they ask on HCl? They asked him The UTME body is asking them on HCl. How do you test for HCl? There are two ways to test for HCl. You use a jar of ammonia or silver nitrate.

[00:05:44]Two ways to test for HCl. So, HCl is acid. Hydrogen chloride acid gas can turn blue litmus turn blue litmus red. HCl and even ammonia is used to demonstrate the fountain experiment. The fountain experiment tells us what soluble gas is.

[00:06:01]The experiment describes the solubility of a gas. So, this was tested during the exam. I think day three yesterday they asked HCl and HCl is used to describe the fountain experiment due to solubility of the gas. So, the solubility of the gas in water. Now, they can change the question. How do you change the question now? They can bring this question out like this. They will ask you, "HCl." They asked in the exam, "HCl What's it called? It is very soluble in water." They normally The solubility of every gas. This is how they can ask now.

[00:06:31]Normally, the solubility of every gas What's it called? Increases with a decrease in temperature. So, the lower the temperature, the more soluble a gas.

[00:06:40]But for HCl, it is the reverse. HCl is the only exception for gases. So, for HCl, the higher the temperature, the more soluble the gas for HCl. Do you get? So, these questions can be tested like that. They can test it. Now, two ways to test for HCl, hydrogen chloride. Hydrogen chloride diffuses Hydrogen chloride Hydrogen chloride forms a white dense fume ammonium chloride when placed in a jar of ammonia. So, if you place hydrogen chloride in a jar of ammonia, it forms a white dense fume.

[00:07:10]Do you get? Now, another way to test for hydrogen chloride is using silver nitrate. So, HCl produce a white precipitate with silver They asked this question yesterday, "Which of the following produce Which of the following is used to test for There are so many options. This one was there.

[00:07:28]HCl produce a white dense fume silver nitrate. That's what they asked for the extraction of sulfur. The extraction of sulfur is via the Frasch process. Via the Frasch process. So, all these questions can be tested.

[00:07:44]They can be tested and I want you to look at them quickly.

[00:07:50]Pause the video. Go back to the video.

[00:07:52]Um At this point in time, if you have not liked this video, you are wrong.

[00:07:56]You are doing the wrong thing. So, I urge you to like the video.

[00:08:01]You probably like it.

[00:08:03]Now, they asked this question, "Rust on a metal three oxide. So, rusting is the corrosion of iron. So, rusting or corrosion occur in the presence of oxygen and water vapor. If you don't corrode that you don't You don't rust or corrode A metal does not corrode does not rust without oxygen and water vapor. There must be oxygen and water vapor. So, brown hydrated iron three oxide rust. Do you get? So, that will be option C.

[00:08:39]Now, they can ask you question on How What kind of question can they ask on this four? Now, how do you prevent rust? To prevent rust, you can coat with zinc, which is called galvanizing.

[00:08:48]If you want to prevent rust, ways to prevent rust coating with zinc, which is called galvanizing.

[00:08:58]So, galvanizing coating, plating. So, I can plate with tin.

[00:09:06]I can do greasing as well. I can grease.

[00:09:11]Do oil painting.

[00:09:13]Oil painting. And that brings me to something.

[00:09:16]They asked this question. The solvent for paints The most common solvent for paints is turpentine. Turpentine is used to make oil paints. This question was tested. Solvent for paints is turpentine.

[00:09:27]Turpentine is used to make oil paints.

[00:09:29]So, you have seen those oil paints used to paint surfaces. The reason many of them are made from turpentine. Do you get? So, this question was tested.

[00:09:39]Another way to prevent rusting again.

[00:09:41]This is a way to prevent rusting.

[00:09:43]Sacrificial cathodic protection. Don't forget that. So, for instance, we use normally use magnesium.

[00:09:49]So, sacrificial cathodic protection.

[00:09:57]So, one way to prevent rusting known as the cathode.

[00:10:03]That's another way to prevent rusting, please.

[00:10:09]I'm I'm preparing a video.

[00:10:12]You'll get it You'll get it today or tomorrow. Now, the video is all that you need in organic chemistry. So, please, if you're writing the exam watching this video, please go follow up to your organic chemistry videos.

[00:10:26]I have videos on this channel on organic chemistry. Look at them.

[00:10:30]Write everything what they can possibly ask.

[00:10:33]This question number four is on organic chemistry. Which organic compound can undergo geometric isomerism?

[00:10:42]Geometric isomerism is common to alkenes.

[00:10:47]Compounds with double bond. Geometric isomerism is common to alkenes.

[00:10:52]Compounds with double bond. So, any compound double bond. So, alkenes, their general formula is CnH2n.

[00:10:59]So, who follows there? That should be one, two.

[00:11:04]Okay, I think this. So, C4H2. So, 2n, 2 * 4 is 8.

[00:11:09]Okay, so this is butene. Butene can have cuz it exhibits geometric isomerism. So, um if I should draw butene for you, it's something like this.

[00:11:22]This is So, this is So, Now, if you check, now why why is it exhibiting geometric isomerism?

[00:11:31]Geometric isomerism when you refer to as cis and trans. So, this is cis.

[00:11:36]So, Why does cis and trans isomer occur?

[00:11:40]Now, because of the restriction of the free rotation about a double bond. Due to the restriction of the free rotation about a double bond. What do we mean? No long talk. Now, this cannot come here.

[00:11:54]You from this H cannot go and replace this H. They cannot interchange. Why?

[00:11:58]Because double bond hinders free rotation.

[00:12:02]So, when we write a new compound when we write another compound that where the CH3 is now up and another one is down, it's different from this one. So, this one is called a trans isomer.

[00:12:12]That one is called a cis isomer. This is geometric isomerism common to alkenes or compounds with double bond.

[00:12:19]Only.

[00:12:20]So, um I'm going to leave a bonus at the end of this video.

[00:12:25]You know the bonus will be on metals.

[00:12:27]What do you say? Every possible thing that JAMB can ask you on metals. I'm just scared from Monday sets.

[00:12:34]Every possible thing that JAMB can ask you Okay, now. The next one is on electrolysis. Okay?

[00:12:41]This is on electrolysis.

[00:12:45]Lovely. This question is lovely.

[00:12:48]Very very lovely. Now, the question says, What quantity of electricity will deposit 212 g of silver?

[00:12:58]Molar mass. So, 212 g of silver with that molar mass. So, I've always if you followed me right from time, I've said this. Now, to calculate most questions, 90% of the questions in JAMB on electrolysis, it goes to FEN. It does the work. Now, what is Q? Q is IT. So, always the question is looking for Q. Quantity of electricity. Current times time. Now, Faraday constant is 96,500. They normally give this in the question but as a student you're supposed to know it.

[00:13:27]96,500 C per mol. So, F times the charge. Silver metal. Silver metal, the charge on silver is usually plus one.

[00:13:35]So, you have plus one silver usually plus one that's on silver.

[00:13:40]>> [clears throat] >> N is mass over molar mass. So, our mass over molar mass. So, molar mass is 106.

[00:13:46]Our mass is 212. So, quickly, I might not need a calculator. You You can just do it when you're when you're on your spare time. So, once you solve this question, F is 96,500. So, solving this kind of question I will say 96,500 times charge on silver which is one times the mass of silver there, 212 g mass all over 106.

[00:14:15]I think we have options. So, the person that sent me this question did not give me options. So, this is how you calculate for Q.

[00:14:22]If you're wondering where did I get F from, 96,500 is Faraday constant. It's constant. Charge on silver, check your electrolysis topic.

[00:14:29]The charge on silver is usually plus one. Okay, it can be silver. It can be silver two. You get but most times it's silver is most silver salts are usually one. Then 212 and AgNO3. So, you get?

[00:14:43]So, this is it.

[00:14:45]So, now lastly, What solder is an alloy of?

[00:14:49]Soft solder alloy of Soft solder is an alloy of which element?

[00:14:56]Soft solder is an alloy of Soft solder is an alloy of lead and tin.

[00:15:02]Let me give you possible alloys. Soft solder is used for plumbing.

[00:15:09]Alloy of lead and tin.

[00:15:12]Lead and tin.

[00:15:14]Lead is a metal that is very dense.

[00:15:16]That's why lead is used to make bullets, one of the most dense metals.

[00:15:21]Um ah, thank thank God. Now, the lead. Now, what what was lead used for? Lead is used to what's it called?

[00:15:30]Lead is used to make bullets also. And lead, the main ore of lead is galena.

[00:15:37]How do you extract lead from galena? If you're writing this this this take note of this.

[00:15:42]How do you extract lead from galena?

[00:15:44]It's by reduction, chemical reduction using coke.

[00:15:47]Reverberatory furnace. Chemical reduction using coke in a reverberatory furnace. The main ore of tin is cassiterite. They have this question.

[00:15:55]How do you extract tin from cassiterite?

[00:15:58]By chemical reduction also using coke.

[00:16:02]So, cadmium lead is in the blast furnace while tin is in the reverberatory furnace. You get? So, they have this question.

[00:16:08]Notes of that. Cassiterite. Cassiterite.

[00:16:10]C A K Can I write it here?

[00:16:14]C A S S I T Yeah, this is cassiterite, the main ore of tin. Galena, the main ore or the principal mineral of lead.

[00:16:23]You get? Another alloy that that the UTME board loves very well is duralumin.

[00:16:28]Duralumin is used to make airplane parts because it contains aluminum which is light and resistant to corrosion. So, duralumin is an alloy that is resistant to corrosion. It's an alloy of aluminum magnesium. So, an alloy of magnesium is duralumin.

[00:16:42]Manganese.

[00:16:44]Copper.

[00:16:46]Aluminum is light and resistant to corrosion. So, that alloy is used to make um But also, um aluminum metal is very light um um cheap also. Aluminum metal is very light and cheap. That's why it's used to make overhead cables.

[00:17:04]That was duralumin. Um aluminum metal is resistant code to corrosion. You should take note of that. And we transport HNO3 in aluminum container.

[00:17:14]We transport HNO3 in aluminum container.

[00:17:16]Another alloy used to make magnets is permalloy.

[00:17:21]Permalloy. Permalloy is an alloy of iron and nickel. Nickel being the base metal.

[00:17:27]That is, nickel is more. Nickel is around over 60 70%.

[00:17:33]Permalloy where iron is the remaining part.

[00:17:36]Permalloy. Another alloy you can be asked Um I'm just taking notes. For iron, the main ore The main ore of iron is hematite.

[00:17:46]The main ore or principal mineral of iron is hematite.

[00:17:50]Hematite is used Hematite. So, this is hematite.

[00:17:54]This is your I think they can also ask you the formula for hematite. Fe2O3.

[00:18:00]O3. This is hematite. This is where you get iron from.

[00:18:03]Iron is extracted from the blast furnace. The main reducing agent in the blast furnace is coke.

[00:18:09]The gritty The earthy impurity in the blast furnace is removed. The earthy impurity in the blast furnace is removed using um what's it called? The earthy impurity in the blast furnace is removed using limestone. The earthy impurity is removed as slag.

[00:18:24]The earthy impurity in the blast furnace is removed as slag. Slag is a compound.

[00:18:29]Let me write it here.

[00:18:31]Compound.

[00:18:34]I Slag is a compound called CaSiO3.

[00:18:39]You get everybody? This is slag.

[00:18:44]Slag. So, limestone is used to remove the earthy or the silica impurity in the blast furnace as slag.

[00:18:49]Another ore of iron is Other ores of iron I feel they can test.

[00:18:54]Magnetite. Magnetite is loadstone.

[00:18:58]Magnetite is magnetic ore of iron, Fe3O4.

[00:19:03]Another one of iron is iron pyrites. Okay, and so on and so forth. So, as I said before, aluminum When you're talking about aluminum, the main ore of aluminum The main ore of aluminum is is bauxite.

[00:19:20]Um bauxite has two forms. Another Another mineral of aluminum So, there's another form of bauxite, corundum.

[00:19:27]So, corundum is different from bauxite.

[00:19:30]The one difference is that bauxite is F or I think bauxite is Al2O3.

[00:19:35]2H2O. Corundum is Al2O3.

[00:19:40]You get? So, um this is the difference between bauxite and corundum. Bauxite and corundum. They are both aluminum oxide. So, they can also ask you Aluminum oxide exists naturally. It can be bauxite. It it can be corrosion depending on what's in the option.

[00:19:55]So, they can ask you aluminum is basically mainly extracted from bauxite.

[00:19:58]Some people use corrosion. Yeah, but bauxite, what do you do to bauxite? You first purify. You purify by sodium hydroxide. using sodium hydroxide.

[00:20:08]You purify using sodium hydroxide and then you dry to get alumina, which is pure aluminum oxide.

[00:20:13]Then electrolysis. So, it means that aluminum is a metal that can be extracted by electrolysis of its oxide.

[00:20:20]While calcium calcium and sodium they're extracted by the electrolysis of their chloride.

[00:20:26]Please don't forget that. Aluminum is extracted from the electrolysis of its oxide ore, which is first purified using sodium hydroxide to get purified alumina. Yeah. But the well calcium and sodium are extracted by the electrolysis of their um electrolysis of their um chlorides.

[00:20:44]Yeah, if you know your your electrochemical series very well, by now you should be aware that in your electrochemical series you should be aware in your electrochemical series I just want to drop something here.

[00:20:54]Elements below um elements below aluminum are extracted by reduction.

[00:21:00]Elements below aluminum are extracted by reduction.

[00:21:04]In your electrochemical series you should be aware of that. So, what I mean is simple.

[00:21:10]What I mean is simple. What I mean is if I have K, I have Na, I have Ca Mg, I have Al, I have Zn Fe What's it called?

[00:21:24]Al I have um Fe, I have um metals metals. Okay, let's see let's use Let's use um Sn, Pb Cu, Hg and so on and so forth. So, elements below aluminum are usually extracted by reduction. Please don't forget chemical thermal reduction. While these elements here above are mainly gotten by electrolysis.

[00:21:56]electrolysis of the chloride. Magnesium is only also electrolysis of the chloride, but aluminum is gotten from the what's it called now electrolysis of its oxide. You don't forget you can ask anybody can ask you all these things. To make the video not too long.

[00:22:12]Okay. So, I'll do another video on this.

[00:22:14]So, please keep posted. Subscribe if this has been helpful. This channel has been helpful.

[00:22:20]Hopefully come in years.

[00:22:21]As science students you are going to do biochemistry, you're going to do chemistry.

[00:22:25]More contents and videos waiting for you.

[00:22:29]Next video till bye. Share this video with your friends. Don't be stingy. God bless you.