1. A solution containing 1 mole per litre each of Cu (NO3)2, AgNO3, Hg2 (NO3)2 and Mg (NO3)2 is being electrolysed by using inert electrodes. The values of the standard oxidation potentials in volts are Ag | Ag+ = ' 0.80 V, Hg | Hg2+ = ' 0.79 V, Cu | Cu2+ = ' 0.34 V, and Mg | Mg2+ = 2.37 V. The order in which metals will be formed at the cathode will be [Hint: Smaller the oxidation potential (higher the reduction potential) of a species, more readily will it be deposited at cathode.]

2. Colloids

3. In the following system, CN' + H2O HCN + OH', the conjugate acid-base pairs are

4. CO2 is

5. (A) Tetracyanomethane (B) Carbon dioxide (C) Benzene (D) 1, 3 butadiene Ratio of σ and π bonds is in order

6. A certain quantity of a gas is collected in a graduated tube over mercury. The volume of the gas at 20° C is 50 ml and the level of the mercury in the tube is 100 mm above the outside mercury level. The barometer reads 750 mm. Volume at S.T.P is

7. Which one of the following reaction is not possible?

8. EAN (Effective Atomic Number) is equal in the (*)

9. The standard emf for the cell reaction Zn + Cu2+ Cu + Zn2+ is 1.10 V at 25°C. The emf for the cell reaction, when 0.1 M Cu2+ and 0.1 M Zn2+ solutions are used, at 25° C is

10. The number of unit cells in 58.5 g of NaCl is approximately

11. Black lead is

12. What is commonly called limestone?

13. Linseed oil is

14. Consider that the first-order decomposition reaction of N2O5 written as 2 N2O5 (g) → 4 NO2 (g) + O2 (g); rate = k[N2O5] N2O5 (g) → 2 NO2 (g) + ½ O2 (g); rate = k/ [N2O5] Which among the following facts is correct?

15. Inert pair effect is shown by

16. Zinc helps in the synthesis of biological protein; this is the basis for using zinc ointment for

17. The pH of a solution obtained by mixing 50 ml of 0.4 M HCl with 50 ml of 0.2 NaOH is

18. Among the species, identify the isostructureal pairs: NF3, NO3 ', BF3, H3O+, HN3.

19. In which of the following cells, will the emf be independent of the activity of the chloride ions?

20. Which of the following is a non-ferrous metal?

21. The electronegativities of N, C, Si and P are such that

22. The tendency for complex formation is maximum in

23. Petroleum is found in

24. The oxidation state of molybdenum in its oxo complex species [Mo2O4 (C2H4)2 (H2O2)]2'

25. A weak acid HA has Ka= 10'6. What would be the molar ratio of this acid and its salt with strong base so that pH of the buffer solution is 5?