CBSE Class 11 Chemistry Sample Paper Set 4

1. Define Modern periodic law. 

2. Which has a larger radius i) Mg or Ca ii) S or C? 

3. Explain why a solid has rigidity but liquids do not have rigidity on the basis of intermolecular forces and thermal energy. 

4. Derive the value of gas constant in SI units. 

5. If 10 volumes of dihydrogen gas reacts with 5 volumes of dioxygen gas, how many volumes of water vapour could be produced? 

6. In a process 701 J of heat is absorbed by a system and 394 J of work is done by the system. What is the change in the internal energy for the process? 

7. Which alkaline earth metal sulphates have the highest solubility in water? 

8. On the basis of quantum numbers. Justify that the 6th period of the periodic table should have 32 elements. 

9. What will be the minimum pressure needed to compress 500 dm³ of air at 1 bar to 200 dm³ at 30°C? 

10. Which has lower energy and which has higher stability? Bonding or antibonding molecular orbitals. 

11. Explain functional groups. 

12. Explain metamerism. 

13. Describe the shape of BF₃ and [BF₄]^-. Assign the hybridization of boron in these species.

14. Explain dead burnt plaster? 

15. What are the atomic numbers of elements whose outermost electrons are represented by

     a) 2p³       b) 3d⁶?

16. Why are lithium salts commonly hydrates while those of other alkali ions are usually anhydrous? 

17. Write the chemical reactions to show amphoteric nature of water.