IIT alumnus shares last-minute CBSE Class 12 Chemistry exam tips!

India Today

IIT alumnus Ankush Sharma shared key last-minute CBSE Class 12 Chemistry tips, covering important topics, the best revision and answering techniques and common mistakes to avoid for a better Chemistry board exam score.

Transcript

00:00Hello students, my name is Ankush, I am senior OSCE faculty at OrchKids International School.

00:15So today I am here to share some tips so that you all can score better in board chemistry

00:21exam.

00:22So as we know that from 21st board exams are going to start.

00:26So chemistry exam is on 27th.

00:29So those who are having AI as their elective subject for them only one day for their preparation

00:36and for such student my sincere suggestion is to start preparing before physics exam

00:40itself and the student who are not taken AI as their elective, they are having around

00:45five days for the preparation.

00:47Now how to do the preparation?

00:49You need to divide your syllabus into three parts which is already divided that is a physical

00:54chemistry, inorganic and organic chemistry.

00:56So physical and inorganic chemistry they contribute around 37 marks and for that you can dedicate

01:02out of five, three days where you can plan all the five chapters in those three days.

01:08Now the remaining five chapters of the organic chemistry which contribute around 33 marks

01:12for that you can keep two days for the revision.

01:16Now how to do revision because chapters are lengthy.

01:19So I'm sure you all have prepared your notes.

01:21So you need to just quickly go through the notes.

01:23You have to make your own mind maps.

01:25You need to make your micro notes that will help you in a quick revision.

01:28You need to use keywords which can you know give you the complete idea about that particular

01:32topic.

01:33So this is how you need to plan.

01:35Now how to check your preparation for that the best source we are having is a previous

01:38questions.

01:39So do as much as previous year questions around five year question paper you should solve.

01:44You will get the you know know where you are making the errors you will get improve your

01:49accuracy you will get to know that how to manage the time and apart from that you need

01:55to follow NCRT rigorously because most of the question you will see that they comes

02:00from NCRT especially if you see that in organic chemistry.

02:04So NCRT generally they ask question from NCRT so do not you know avoid NCRT it's a very

02:10very important textbook just like a Bible for the chemistry.

02:15Now apart from that some common error which student generally do during exam is because

02:19of you know lack of alertness in the exam.

02:24So they do not read questions carefully and if they don't read question for definitely

02:28they may make mistake in writing the answers because they may skip some key information

02:33or they may skip some key idea in a question.

02:36You should focus on a question carefully.

02:39Second thing numericals are you know physical chemistry maximum number of numericals comes

02:44from physical chemistry right.

02:46So you should use correct formula, correct logic, correct units, correct symbols, substitution

02:54with correct units and double check your calculation in chemistry.

03:00Then after that when you are writing the inorganic chemistry especially in IUPAC name you are

03:05making lot of mistake.

03:06You need to follow the rules very very rigorously whatever written in NCRT similarly to follow

03:12the rules by writing their IUPAC name there should be no confusion between the IUPAC name

03:17as well as the common name of the compounds.

03:19Then we are having in organic chemistry student generally make mistake in mechanisms, student

03:25make mistake in writing the reagents you should be very much clear about the reagents what

03:30reagent you are using there should be no confusion in that.

03:33So avoid these mistakes and get your best scores.

03:37Now after this we are having some important topic as we are having lot of topic in chemistry

03:44but I have picked certain few topic from different different chapters.

03:47First of all we talk about the physical chemistry.

03:49In physical chemistry if we see that the first chapter solution chapter the numerical comes

03:55from the solution chapter.

03:56So what are the topic for the numerical like we are having Raoult's law then we are having

04:00molarity calculation, molarity calculation then we are having colligative properties

04:06in that osmotic pressure or abnormal molar mass based numerical can be asked.

04:12Then we are having Henry's law and its application and we are having azeotropes these are the

04:16important topics in a solution chapter.

04:19Then come to the your electrochemistry part, electrochemistry part definitely question

04:24will come from based upon your the lead storage battery or based upon the reactions or maybe

04:30from the you know the fuel cell and based upon fuel cell questions can be asked.

04:35Now if we talk about the numerical part so in that definitely numerical will come from

04:39these topic we are having Kolar's law then we are having Faraday's law we are having

04:43Nernst equation we should use these with the right formula there should be no confusion

04:48again I am telling in formula and in the application of you know substitution or in calculation.

04:54Definitely numerical will come then we are having the limiting molar conductivity again

05:00you have to take care about the units.

05:02If it our third chapter so in that we are having chemical kinetics rate of reaction

05:07and then we are in molecularity versus order of reaction then we are having the rate of

05:11reaction elementary versus you know complex reactions so these are topic which are important.

05:17Numericals generally asked based upon your first order or pseudo first order or based

05:21upon Arrhenius equation numericals asked from this chapter.

05:25Now after this we are having if we talk about the inorganic chemistry so inorganic chemistry

05:31we are having like D and F block in D and F block properties are very important D and

05:37F block then we are having lengthenite actinide contraction very important and differences

05:43between similarity between them is very important then we can say trends in a transition element

05:49very important ionization oxidation state magnetic spin magnetic properties they are

05:54very important preparation of potassium dichromate and potassium permanganate very important

06:00their oxidizing properties are very important so these are the few topics that are from

06:05the D and F block some questions which are you know the very frequent kind of questions

06:10that like why we are having you know the same size of your zirconium and hafnium so that

06:18is a very important question so these are the few topic we are having from the transition

06:23element that is D and F block.

06:26So the second segment we are having is inorganic chemistry which is around 14 marks so in that

06:30we are having two chapters D and F block and coordination compounds in D and F block

06:34if we see that the properties of D and F block element is important then the lengthenite

06:39actinide contraction and their differences between them similarities between them and

06:44the properties of your transition element like ionization potential oxidation magnetic

06:48properties very important then after that we can say that the color and the catalytic

06:52properties of the transition metals is important then we can say preparation of potassium dichromate

06:58and potassium permanganate is very important and along with their oxidation properties

07:03so these are the few topics from D and F block along with that you need to focus more on

07:08the questions which are there in NCRT.

07:11Then the next chapter in inorganic is your coordination compound in coordination compound

07:15very important is your IUPAC names you should follow the rules rigorously for IUPAC names

07:21there should be no confusion in the rules after that we are having the valence bond

07:27theory very important then we are having second crystal field theory important isomerism

07:32both structural as well as geometrical isomerism is important then we have the chelate effect

07:37hybridization so these are the few important topics from coordination compounds again NCRT

07:43is very important so this is the section from inorganic.

07:48So the last section we are having is organic chemistry 33 marks so 4 plus biomolecules

07:53out of 4 chapter important naming reaction test and mechanisms are as in naming reaction

07:59important is your SWOT reaction, Finkelstein reaction, Hydroboration, Colvay, Reimer, Timer,

08:04Williamson, Ittard, Rosemann reaction, Aldol condensation, Cannizzaro reaction, Clemenson

08:09reaction, Woll-Kirschner reaction, Gabriel reaction, Hoffman reaction these are the very

08:14very important reaction you need to focus practice them multiple times multiple times

08:18so that you should not make any mistake in exam definitely naming reactions are going

08:23to come in the exam so you can check the previous questions also definitely will find

08:27these naming reactions there also in future exams also the naming reaction can come should

08:32not make any mistake then important test we are having is your Lucas test then we are

08:36toluene test then we are having Phelan test, Iodoform test, Carbolamine test, Insperg test

08:43and we are having Azodite test so these are the important tests we should focus then important

08:49mechanism SN1, SN2 mechanism are important then we are having Acidic dehydration of alcohol

08:54is important an addition of HI2 is important, Esterification, Nucleophilic addition important

09:00then apart from that Bromination and Nitration of aniline is important, Acidic nature of

09:05alcohol phenol and carboxylic acid is important basic nature of amines both in gases as well

09:13as in aqua phase so these are a few topics you should focus and again I'm telling you

09:19focus more on NCRT questions exercise in text questions are very very important now

09:24the last chapter we are having is biomolecules that will give you 7 marks theoretical chapter

09:28easy chapter but lengthy chapter number one amino acids important second degree structure

09:33of a protein then we are having DNA RNA structures as well as difference then we have vitamins

09:38water soluble insoluble vitamins then we are having is a question based upon the structure

09:43of glucose so these are the few topics which I have shared definitely there they will help

09:49you in scoring good marks in CVSE chemistry exam so thank you so much and I wish that

09:55you all will come out with the flying colors so wish you all the best.

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