CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A

Read and download CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A designed as per the latest question paper pattern and Class 12 examination guidelines issued by CBSE, NCERT and KVS. The past year Question Papers for Class 12 Chemistry have been provided with solutions which will help students to assess their performance and find out topics in Chemistry Class 12 which they need to improve to get better marks in Class 12 exams. After solving these last year papers also refer to solved Sample Papers for Class 12 Chemistry available on our website to build strong understanding of the subject

Chemistry Question Paper Class 12

Students can refer to the below Class 12 Chemistry Question Paper designed to help students understand the pattern of questions that will be asked in Class 12 exams. Please download CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A

Chemistry Class 12 Question Paper

SECTION A
Read the given passage and answer the questions number 1 to 5 that follow :
 
The substitution reaction of alkyl halide mainly occurs by SN1 or SN2 mechanism. Whatever mechanism alkyl halides follow for the substitution reaction to occur, the polarity of the carbon halogen bond is responsible for these substitution reactions. The rate of SN1 reactions are governed by the stability of carbocation whereas for SN2 reactions steric factor is the deciding factor. If the starting material is a chiral compound, we may end up with an inverted product or racemic mixture depending upon the type of mechanism followed by alkyl halide. Cleavage of ethers with HI is also governed by steric factor and stability of carbocation, which indicates that in organic chemistry, these two major factors help us in deciding the kind of product formed.
 
1. Predict the stereochemistry of the product formed if an optically active alkyl halide undergoes substitution reaction by SN1 mechanism.
 
2. Name the instrument used for measuring the angle by which the plane polarised light is rotated.
 
3. Predict the major product formed when 2-Bromopentane reacts with alcoholic KOH.
 
4. Give one use of CHI3.
 
5. Write the structures of the products formed when anisole is treated with HI.
 
Questions number 6 to 10 are one word answers :

6. Identify which liquid will have a higher vapour pressure at 900C if the boiling points of two liquids A and B are 1400C and 1800C, respectively.
 
7. Out of zinc and tin, whose coating is better to protect iron objects ?
 
8. Will the rate constant of the reaction depend upon T if the Eact (activation energy) of the reaction is zero ?
 
9. Give the structure of the monomer of PVC.
 
10. Which structural unit present in a detergent makes it non-biodegradable ?
 
Questions number 11 to 15 are multiple choice questions :
 
11. Out of the following, the strongest base in aqueous solution is
 
(A) Methylamine
 
(B) Dimethylamine
 
(C) Trimethylamine
 
(D) Aniline
 
12. Iodoform test is not given by
 
(A) Ethanol
 
(B) Ethanal
 
(C) Pentan-2-one
 
(D) Pentan-3-one
 
13. Out of the following transition elements, the maximum number of oxidation states are shown by
 
(A) Sc (Z = 21)
 
(B) Cr (Z = 24)
 
(C) Mn (Z = 25)
 
(D) Fe (Z = 26)
 
14. Hardening of leather in tanning industry is based on
 
(A) Electrophoresis
 
(B) Electro-osmosis
 
(C) Mutual coagulation
 
(D) Tyndall effec
Please click on below link to download CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A.

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Previous Year Question Paper Chemistry Class 12

We hope you liked the above provided CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A. To get an understanding of the type of questions which were asked in previous year exams, it is important for Class 12 students to refer to CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A that we have provided above. Students can download all the Question Papers for Class 12 Chemistry which were issued in the exams so that you can practise them and solve all types of questions which have been asked till now. If you do CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A for Class 12 Chemistry you will easily understand the way examination question papers are set by teachers.

Class 12 Chemistry Previous Year Question Papers

The past year question papers CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A covers all the topics which have been suggested by CBSE in their Class 12 Chemistry syllabus for the current year. By doing all CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A PYP (previous year papers) you will understand the regular questions and MCQ questions for Class 12 Chemistry which are always asked and learn them so that you can get full marks in those questions.

Class 12 Chemistry Model Question Paper Pdf Download

We have provided links above of CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A in Pdf format so that you can just click the links and easily download the papers with answers. On studiestoday, we have also provided a download and print option for all CBSE Class 12 Chemistry last year papers and Sample Papers for Class 12 Chemistry to make it more easy for students. You can download CBSE Class 12 Chemistry Previous Year Question Papers and Class 12 Chemistry Sample Papers in PDF absolutely free of cost.

Chemistry Previous Year Question Papers Class 12 with Solutions

We have provided CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A with solutions. You will be able to understand the type of answers which you should write in Class 12 Chemistry exams to score good marks. You should attempt all the last year question paper for Class 12 and Class 12 Chemistry MCQ Test in examination conditions at home and then compare their answers with the solutions provided by our teachers. This way you will be able to identify your weak areas and also understand how the teachers of Class 12 Chemistry set their questions in the exams.

CBSE Class 12 Chemistry Previous Year Question Papers with solutions

We have provided the last 10 years Class 12 Chemistry Question Papers. Students who want to practice question papers from all previous years can easily get them on studiestoday. We are the leading website in India from which you can download all the latest Class 12 Chemistry study material for free as per the CBSE syllabus for Class 12 Chemistry for the current academic year.
 

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