OSSC ATO 2026..MCQ practice Session on Engineering Chemistry

[00:00:01]Hello my dear friends, part two of the engineering chemistry of welcome to theoretical question from chemistry I will discuss with you. The first question I will explain A Lewis base is who donates a pair of proton, accepts a pair of proton, accepts a pair of electron, donates a pair of electron.

[00:00:21]But option you can get it about proton I want to hear concept A B option something out there. We have two options. Accept a pair of electron or D donates a pair of electron. So I will use here I will put it on the Lewis base donates a pair of electron. Donate for a friend. Take some of the Lewis acid for example I will option in the accept a pair of electron. But question I will use Lewis base. So it donates a pair of electron.

[00:00:50]Okay friends.

[00:00:55]Next question is the last.

[00:00:57]Which method is used to separate easily fusible material like tin and lead? The core process tin and lead extraction the process way process like electrolysis reduction oxidation or reduction method distillation or liquefaction distillation means it have one type of refining process basically water related substance distillation we use for that.

[00:01:23]I think answer is liquefaction.

[00:01:27]The tin and lead extraction by friend liquefaction process cool the heart Okay.

[00:01:33]Then when question number three What is the other name of direct chemical conversion?

[00:01:39]It is a question your chemically I want to convert which material or different form or corrosion the whole different but directly let's say corrosion or not going on okay.

[00:01:49]The option corrosion I mean my mind establish this question related to corrosion.

[00:01:55]Wet corrosion soil corrosion, atmospheric corrosion, dry corrosion.

[00:02:02]So, the B option is out of the race.

[00:02:05]Then, friend, wet corrosion is left. The definition of direct chemical conversion The atmosphere in the presence of the atmosphere what it is called directly chemically conversion.

[00:02:17]So, the answer is your friend dry corrosion.

[00:02:21]Which is the other name of the direct chemical conversion? That is also known as dry corrosion. Right? Okay. Next question.

[00:02:30]The unique property of carbon atom to form long chain is called Catenation, distillation, isomorphism, allotropy. Okay. So, the distillation is a refining procedure. So, it's out of the race. Allotropy allotropy metallic structure is a concept actually. Okay.

[00:03:01]Isomorphism Okay.

[00:03:07]Evaporation concept isomorphism concept has come. So, the answer is your friend that is known as your catenation.

[00:03:15]Okay. So, remember carbon long chain formation is a process which is known as catenation. Right? Okay. Next.

[00:03:25]Impurities are removed from a crude metal through the process of calcination roasting, refining, smelting. So, calcination and roasting method is there. Through the blast furnace material smelting is done. Same procedure that we calcination method is used for extraction. Another method roasting with her and use Gucci.

[00:03:58]Impurities are removed.

[00:04:02]Directly from option number C that is the refining process.

[00:04:13]But you don't know if you have these are used to generate big iron.

[00:04:21]Calcination roasting method way refining process way.

[00:04:26]metal extract way.

[00:04:28]refining.

[00:04:31]Then friend next question. What is the IUPAC name CH triple bond C CHCH2?

[00:04:39]The CH triple bond C CH double bond CH2.

[00:04:52]Okay, no doubt.

[00:04:53]Bond friends of highest bond quota you can triple bond at C.

[00:04:58]Then alkane alkene alkyne the friend YN you have a I think you have to clear to me. The option from the view between The C of the option out of the race. I'm going to option with you. View 3 E N 1 YN. View 1 E N 3 YN. The 80 double bond view triple bond view.

[00:05:21]I get friend more al alkene and alkaline one more again. Alkene more preference to me. So this should be get the lowest number.

[00:05:32]You get it friend. So I can move get the liquid answer. View chapter of the view a number position of the double bond one double one alkane alkene EN. I don't know what you mean EN.

[00:05:46]Then friend the number position of the triple one or liquid three. Triple bond three I'm going to call it a friend alkane, alkene, alkyne. So friend, I'm going to give you y n e.

[00:05:57]So this will be friend your final answer.

[00:06:01]So friend, if you have double bond and triple bond, you must give priority to the single double bond. You must give priority to the single double bond.

[00:06:08]Next question I will give you.

[00:06:11]In benzene benzene what [clears throat] I have the compound that has a chemical formula of C6H6.

[00:06:18]In benzene, the carbon atom are the same question with benzene that you have the uh basically [clears throat] formula that is C6H6.

[00:06:29]Okay.

[00:06:32]The same question with the carbon atom are co-hybridization of each and every the way we get the hybridization The hybridization of the I have already told you the orbital s p d f.

[00:06:49]Right? The brother on the s orbital name of the current one pair of electron energy p orbital different three different pair of electron energy.

[00:06:58]The bottom of the s p combine energy friend s r b m r electron plus p r b electron.

[00:07:04]The sub cell friend one of them that process making is known as a hybridization process.

[00:07:09]I'm going to give you the in benzene the carbon atom are always sp2 hybrid. That means s r b g t v o p r b t t v o d j r combine energy the double bond sp2. The same thing friend on the atom of the s r b g t v o p r t t v o double bond sp3.

[00:07:27]The friend benzene there sp2 hybridization process complete okay.

[00:07:31]Next question is Duralumin is an alloy of The brother if you can guess for me duralumin lumin is of the different type of the aluminum alloy type of the compulsory for the option which is available there is some option which is available there is aluminum there is >> The brand new aluminum is the alloy of aluminum and copper, aluminum and iron, aluminum carbon, aluminum and mercury.

[00:07:54]You're already told about that.

[00:07:56]The option out of the race.

[00:07:58]The brand iron we know confusion with aluminum copper with the carbon with the Duralumin is an alloy of aluminum and copper.

[00:08:06]Right? Okay. Next process.

[00:08:10]Uh in a smelting process, which metal can be extracted?

[00:08:15]Smelting this way roasting this way to smelting process base mode conversion process with a bottle basement conversion this way way over blast furnace with the way the core metal with the extract core with the use core with the with the same way with the core with the friend I mean core with the pig iron by the core pig iron with the core with the refined core with the wrought iron with the prepared core with the Okay. The smelting process with the friend iron core extract core The option B here with the friend of the correct answer. Okay. The friend is having question with the junior library assistant 2016 plus 2023 with the question with the discuss with You have a friend more than just a question with the more than a problem already with the question say that more than a problem with the core with the question The more question with the friend first question with the more than a problem with the In a molecule, one of the atom has low ionization energy and the other atom has high electron affinity.

[00:09:09]The bond will be getting Okay. The more than a question with the more than a problem with the question The more than a question with the more than a problem with the question with the more than a problem with the question with the more than a problem with the question with the more than a problem with that characteristic is very very important to form a ionic bond. Okay. So, the atom is having low ionization energy and high electron affinity I said that the characteristic with the satisfied with the One is atom with the low ionization energy and other atom is having high electron So, the bond will be formed is ionic bond.

[00:09:41]Also, the best way to do the question I want to ask such. Correct? Okay.

[00:09:48]Let's go to the next question.

[00:09:50]Electrons are filled in different sub-cell in order of increasing energy content according to the electron orbital s p d f fill up on the according to the level of increasing energy content.

[00:10:04]Who is the rule?

[00:10:05]Aufbau principle, Hund's rule, Planck's law. The Hund's rule is the aromaticity used way. This is out of the list.

[00:10:12]Planck's law and radiation are used way.

[00:10:14]This is out of the list. Confused Hund's rule with the Aufbau principle.

[00:10:19]Increasing energy content due to the Aufbau principle.

[00:10:24]You know that the question is on the pairing of electron cool rule way. I can say the answer as a Hund's rule.

[00:10:30]Right? Okay.

[00:10:32]Next question.

[00:10:34]Which of the following is the chemical formula of phenol? Okay.

[00:10:39]The phenol is going to be phenol is an aromatic compound. So, that means it must be made from the benzene structure.

[00:10:46]I want to know if you have been benzene formula of the C6H6, right? The phenol came to go our constituent group right here benzene cool group of good day. I want a hydrogen carbon atom to remove our hydrogen atom.

[00:11:00]The C6H6 benzene particular C6H5OH, C6H4CH2, C5H5OH.

[00:11:09]Okay. The OH is the hydroxyl group with related to phenol.

[00:11:14]Okay. The C6H5OH C5. The answer is going to be B C6H5OH.

[00:11:22]The C6 hydrogen atom going to remove hydrogen OH group added here. The formula phenol C6H5OH.

[00:11:32]Then friend, next question.

[00:11:34]Bakelite is formed by the process of polymerization, condensation and polymerization, additional polymerization, none of these will be the answer.

[00:11:50]So, this is made from the process of condensation and polymerization.

[00:11:59]Another one is the condensation polymerization.

[00:12:09]That is called additional polymerization like PVC, okay, polythene, etc. Chemical processes that are byproducts and water are released. That is known as a condensation and polymerization.

[00:12:28]Bakelite Bakelite is a combination of phenol plus formaldehyde.

[00:12:44]So, Bakelite is formed by the combination of Bakelite formed by the combination of phenol plus formaldehyde.

[00:12:51]Okay, friend. So, friend, good good very very important question we have to discuss today. Problem definitely I'll solve the question with definite practice.

[00:13:00]Exam rate of good outcome. Help Okay.

[00:13:03]So, friend, this is the end of the chemistry. Next up on my engineering mechanics friend video will be out soon.

[00:13:08]Thank you.