CBSE Class 12 Chemistry Sample paper 2017 Set C

1. What type of defect can arise when a solid is heated? Which physical property is affected by it?

2. In an aqueous solution how does specific conductivity of electrolytes change with addition of water?

3. For a certain reaction, large fraction of molecules has energy more than the threshold energy, yet the rate of reaction is very slow. Why?

4. Name the product formed when Iodopropane reacts with (i) potassium nitrite and (ii) silver nitrite

5. What is the role of ZnCl₂ in a dry cell? 

6. Why is it necessary to avoid even traces of moisture during the use of a Grignard reagent?

7. What is the main product formed when :

i) Bromoethane is refluxed with NaI in acetone

ii) 2-Chloropropane reacts with Na in dry ether

8. Analysis shows that nickel oxide has a formula Ni_0.98 O_1.00. What fraction of nickel exists as Ni^₂₊ and as Ni³⁺ ions?

9. In the following cases, rearrange the compounds as directed :

a) In decreasing order of basic strength :

C₆H₅NH₂, p-nitroaniline and p-toluidine

b) In decreasing order of pkb value in aqueous medium

NH₃, CH₃NH₂, (CH₃)₂NH, (CH₃)₃N

10. Why is dialkyl cadmium superior to Grignard reagent for the preparation of a ketone from an acid chloride?

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