CBSE Class 12 Chemistry Boards 2020 Question Paper Set 04 Solved

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Previous Year Question Papers for Class 12 Chemistry

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 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
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CBSE Class 12 Chemistry Boards 2020 Question Paper Set 04 Solved & Previous Year Question Papers for Class 12 Chemistry

Previous Year Question Papers: Class 12 Chemistry

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The CBSE Class 12 Chemistry Boards 2020 Question Paper Set 04 Solved is available for download on StudiesToday.com. It includes complete set with all sections so that Class 12 students can practice with the exact same paper that came in the CBSE exams.

Are the solutions for CBSE Class 12 Chemistry Boards 2020 Question Paper Set 04 Solved based on the official CBSE marking scheme?

Yes, the solutions for CBSE Class 12 Chemistry Boards 2020 Question Paper Set 04 Solved are prepared by subject matter experts as per official marking scheme. Class 12 students will understand the structure of answers and 'step-marks' methodology Chemistry.

How does solving CBSE Class 12 Chemistry Boards 2020 Question Paper Set 04 Solved help in preparing for the 2026 exams?

Solving previous year papers like CBSE Class 12 Chemistry Boards 2020 Question Paper Set 04 Solved is important to understand repeat themes and question difficulty levels of Chemistry. It helps Class 12 students to test their time management skills too.

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Yes, where applicable, CBSE Class 12 Chemistry Boards 2020 Question Paper Set 04 Solved is available in both English and Hindi mediums. All students from Class 12 can access Chemistry study material in their preferred language.

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