CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set D

Access and download CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set D, carefully designed as per the latest 2025-26 examination guidelines issued by CBSE, NCERT, and KVS. These Class 12 Chemistry previous year question papers include detailed solutions, helping students to assess their performance and identify and improve key areas before the final exams.

Solved Chemistry Question Papers for Class 12

Practicing these Class 12 Chemistry question papers is the best way to understand the actual exam pattern and marking scheme. By solving these papers under timed conditions, Class 12 students can improve their speed and accuracy. Download the full CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set D to begin your self-assessment today.

Chemistry Class 12 Question Paper PDF with Solutions

 SECTION – A
Read the given passage and answer the questions 1 to 5 that follow :
 
Colloidal particles always carry an electric charge which may be either positive or negative. For example, when AgNO3 solution is added to KI solution, a negatively charged colloidal sol is obtained. The presence of equal and similar charges on colloidal particles provide stability to the colloidal sol and if, somehow, charge is removed, coagulation of sol occurs.
Lyophobic sols are readily coagulated as compare to lyophilic sols.
 
1. What is the reason for the charge on sol particles ?
 
2. Why the presence of equal and similar charges on colloidal particles provide stability ?
 
3. Why a negatively charged sol is obtained on adding AgNO3 solution to KI solution ?
 
4. Name one method by which coagulation of lyophobic sol can be carried out.
 
5. Out of KI or K2SO4, which electrolyte is better in the coagulation of positive sol ?
 
Questions 6 to 10 are one word answers :
 
6. Name the method applied for the concentration of Bauxite ore in the extraction of Aluminium.
 
8. Write an isomer of C3H9N which gives foul smell of isocyanide when treated with chloroform and ethanolic NaOH.
 
9. Which one of the following is an antidepressant drug ?
Chloramphenicol, Luminal, Bithional
 
10. Write the name of component of starch which is water soluble.
 
Questions 11 to 15 are Multiple Choice Questions :
 
11. How many ions are produced from the complex [Co(NH3)5Cl] Cl2 in solution ?
(a) 4        (b) 2          (c) 3           (d) 5
 
12. In a lead storage battery
(a) PbO2 is reduced to PbSO4 at the cathode.
(b) Pb is oxidised to PbSO4 at the anode.
(c) Both electrodes are immersed in the same aqueous solution of H2SO4.
(d) All the above are true.
 
13. The slope in the plot of ln [R] Vs. time gives
(a) + k         (b) + k /2.303
 
(c) – k         (d)  – k /2.303
 
(where [R] is the final concentration of reactant.)
 
14. The pair [Co(NH3)4 Cl2] Br2 and [Co(NH3)4 Br2] Cl2 will show
 
(a) Linkage isomerism              (b) Hydrate isomerism
(c) Ionization isomerism           (d) Coordinate isomerism
 
15. An α-helix is a structural feature of
(a) Sucrose               (b) Polypeptides
(c) Nucleotides          (d) Starch
Please click on below link to download CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set D.

CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set D

To understand the types of questions asked in past examinations, it is very important for Class 12 students to solve the CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set D provided above. You can easily download these past papers for Class 12 Chemistry in PDF format for the last 10 years. By practicing these actual exam questions you will gain an understanding of the difficulty level and the variety of topics covered over the years. By solving these Previous Year Papers (PYPs) you will understand both descriptive and MCQ questions in your final tests.

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Regularly practicing CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set D is the best way to improve your score in Class 12 Chemistry. These papers will give you details of the marking scheme and the paper structure used by the CBSE. By regularly attempting these under actual exam conditions at home, you can slowly improve your time management skills, which will help you to complete your Chemistry paper within the allowed duration.

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