CBSE Class 12 Chemistry Sample paper 2014 Set B

1. How many atoms constitute one unit cell of a face-centered cubic crystal? 

2. Name the method used for the refining of Nickel metal. 

3. What is the covalency of nitrogen in N₂O₅? 

4. Write the IUPAC name of CH₃ –CH – CH₂ – CH = CH₂     

                                                                  ¦

                                                               C l

5. What happens when CH₃–Br is treated with KCN ? 

6. Write the structure of 3-methylbutanal. 

7. Arrange the following in increasing order of their basic strength in aqueous solution. CH₃NH₂, (CH₃)₃N, (CH₃)₂NH

8. What are three types of RNA molecules which perform different functions? 

9. 18 g of glucose, C₆H₁₂O₆ (Molar Mass = 180 g mol–1) is dissolved in 1 kg of water in a sauce pan. At what temperature will this solution boil? 2 (Kb for water = 0.52 K kg mol–1, boiling point of pure water = 373.15 K)

10. The conductivity of 0.20 M solution of KCl at 298 K is 0.025 S cm^–1. Calculate its molar conductivity.

11. Write dispersed phase and dispersion medium of the following colloidal systems : 

(i) Smoke

(ii) Milk

OR

What are lyophilic and lyophobic colloids ? Which of these sols can be easily coagulated on the addition of small amounts of electrolytes?

Please refer to attatched file for CBSE Class 12 Chemistry Sample paper 2014 Set B