CBSE Class 12 Chemistry Sample paper 2015 Set 03

1. Which point defect in its crystal units increases the density of a solid?

2. What is meant by an elementary reaction?

3. Name the two types of adsorption of gases on solids.

4. What is the role of collectors in Froth Floation process?

5. What is the IUPAC name of: [Ag(NH₃₎₂][Ag(CN)₂] .

6. Draw the structure of 2-Ethoxy -1,1-dimethylcyclohexane.

7. Arrange the following compounds in an increasing order of their acid strength:

Benzoic acid, 4-Nitrobenzoic acid, 4-Methoxybenzoic acid.

8. Write any one difference between amylase and amylopectin?

9. Mixing of acetone and chloroform occurs with reduction in volume and is exothermic process. What change will occur in vapour pressure? Explain your answer.

10. Define the following:

i)Order of a reaction ii)Activation energy of a reaction.

(or)

List two factors on which the rate of a chemical reaction depends.

11. For the reaction A----→ B, the rate of reaction becomes twenty seven times when the concentration of A is increased three times. What is the order of the reaction?

12. Describe the principle involved in each of the following processes:

i)Electro refining ii)Mond’s process for refining of Nickel

13. What are interstitial compounds? Why are such compounds well known for transition metals?

14. Draw a figure to show splitting of degenerate d-orbitals in an octahedral field. How does the magnitude of the Δo decides the high spin and low spin complexes.

15. The treatment of alkyl chlorides with aqueous KOH leads to the formation of alcohols but in the presence of alcoholic KOH, alkenes are major products. Explain.

16. How the following conversions can be carried out?

i) Chloroethane to butane ii)Isopropyl alcohol to Iodoform

Please click the below link to access CBSE Class 12 Chemistry Sample paper 2015 Set C