1. Name the physical quantity whose SI unit is Candela.

2. State Avogadro's law.

3. Write Bragg's equation.

4. Define critical solution temperature.

5. Define degrees of freedom of a system.

6. The order of the following reaction
aA bB mM nN

is 2 with respect to A and 1 with respect to B. Write differential rate law for the reaction.

7. What are the units of molar conductivity?

8. Draw a labelled diagram showing the distribution of speeds of gas molecules at three different temperatures T1, T2 and T3, where T1 <T2 <T3.

9. Water is more viscous than chloroform and glycerol is more viscous than water. Explain.

10. Two liquids A and B show an upper critical solution temperature of 56·7°C. Addition of some amount of a compound X changed it to 51·9°C while the addition of Y changed it to 62·5°C. Comment on the nature of these compounds X and whether soluble in one of the two liquids A or or soluble in both. Addition of which one of the two compounds, X or Y increases the mutual solubility of A and B ?

11. What is an eutectic? Show that the eutectic point is invariant.

12. When dissolved in water, what type of salts would produce a basic solution Name the phenomenon responsible for it.

13. Derive a relation between Kp and Kc for the reaction

H2 CO2 H2O CO

14. The half-life of a reaction

A Products

is independent of the initial concentration of A.
What is the order of the reaction

(ii) If the concentration of A reduces to 50% of its initial value in 500 in how much time would it reduce to 12·5% of its initial value?

15. Draw Andrew's isotherms of carbon dioxide at
a temperature above its critical temperature,

(ii) its critical temperature, and

(iii) a temperature below its critical temperature. Explain their main features.

16. What is meant by vapour pressure of a liquid How is it related to boiling point, and intermolecular forces

17. Define the enthalpy of neutralisation. Would the value of enthalpy of neutralisation be more or less than -57.3 kJ when one mole of a weak acid is neutralised by NaOH Explain.

18. The efficiency of a Carnot engine is 0·60. What is the temperature of its sink if that of its source is 500 K How much work is produced if it absorbs 1 kJ heat from its source?

19. Calculate the time required to discharge all the cr3 ions from 500 cm^3 of 0·270 M Cr2(SO4)3 by a current of 3·00 A.

20. Derive a relation between the solubility and the solubility product for Ba3(PO4)2.

21. Describe the construction of Weston cell with the help of a diagram and write the cell reaction.

22. Derive temperature-volume relationship for a reversible adiabatic expansion of an ideal gas.

23. Derive the following Maxwell's relations:

<br><br> <img src='./qimages/9452-23.jpg'>

24. State Stark -Einstein law of photochemical equivalence. Calculate the energy of one einstein of radiation of wavelength 310 nm.

25. Give the assumptions made by Langmuir to obtain his adsorption isotherm.

26. State Raoult's law. The vapour pressure of an aqueous solution containing 28% by mass of liquid A (molar mass 70 g is 2·4 x 10^5 Pa at 360 K Find out the vapour pressure of pure A if that of pure water is 0·88 x 10^5 Pa.

27. A 0·1 molar solution of NaCl is isotonic with urea solution. Find out Van't Hoff factor and

(ii) degree of ionization of NaCl.

28. Write short notes on any two of the following:

(a) Associated colloids Electro-dialysis Electrophoresis Cleansing action of soaps and detergents