Sunday, August 17, 2008

Inorganic Chemistry Past JEE Fill Blanks Questions

Fill in the blanks

1. The increase in solubility of iodine in an aqueous solution of potassium iodide is due to the formation of ___________ . (1982)

2. Galvanization of iron denotes coating with ___________ .(1983)

3. If metal ions of group III are precipitated by NH4Cl and NH4OH without prior oxidation by conc. HNO3 ___________ in not completely precipitated. (1984)

4. Sodium dissolved in liquid ammonia conducts electricity because _________. (1985)

5. Hydrogen gas is liberated by the action of aluminum with concentrated solution of ___________. (1987)

6. Silver chloride is sparingly soluble in water because its lattice energy is greater than __________ energy. (1987)

7. _______ phosphorus is reactive because of its highly strained tetrahedral structure.

8. In extractive metallurgy of zinc, partial fusion of ZnO with coke is called _______ and reduction of the ore to the molten metal is called ____________ .
(smelting, calcining, roasting, sintering) (1988)

9. The salts _________ and _______________ are isostructural.
(FeSO4.7H2O; CuSO4.5H2O; MnSO4.4H2O; ZnSO4.7H2O)

10. ______________ acid gives hypo ____________ ion.
(hydrobromic, hypobromous, perbromic, bromide, bromite, perbromate) (1988)

11. Sulphur acts as ___________ agent in vulcanization of rubber. (1989)

12. The basicity of phosphorus acid (H3PO3) is ____________ . (1990)

13. In P4O10, the number of oxygen atoms bonded to each phosphorus atom is _________ . (1992)

14. The lead chamber process involves oxidation of SO2 by atmospheric oxygen under the influence of __________ as catalyst. (1992)

15. Ca2+ has a smaller ionic radius than K+ because it has __________- . (1993)

16. The formula of the deep red liquid formed on warming dichromate with KCl in concentrated sulphuric acid is ______________ . (1993)

17. The two types of bonds present in B2H6 are covalent and __________ . (194).

18. The type of magnetism exhibited by [Mn(H2O)6] 2+ is ________________ . (1994)

19. One recently discovered allotrope of carbon (e.g., C60) is commonly known as _________ . (1994)

20. Among PCl3, CH3+, NH2-, and NF3, ___________ is least reactive towards water. (1997)

21. A solution of sodium in liquid ammonia at -33˚C conducts electricity. On cooling, the conductivity of this solution ______________ .

22. When an aqueous solution of sodium fluoride is electrolysed, the gas liberated at the anode is ___________ .

23. Silver jewellery items tarnish slowly in the air due to their reaction with ___________. (1997).

24. Compounds that formally contain Pb4+ are easily reduced to Pb2+. The stability of the lower oxidation state is due to _____ . (1997)

Answers some time later

INorganic Chemistry - Past JEE - True or False questions

State whether the following statements are true or false

1. Red phosphorus is less volatile than white phosphorus because the former has a tetrahedral structure. (1982)

2. MgCl2.6H2O on heating gives anhydrous MgCl2. (1982)

3. When PbO2 reacts with a dilute acid, it gives hydrogen peroxide. (1982)

4. Copper metal reduces Fe2+ in an acid medium. (1982)

5. Silver fluoride is fairly soluble in water. (1982)

6. Dilute HCl oxidizes metallic Fe to Fe2+. (1983)

7. In an aqueous solution chlorine is a stronger oxidizing agent than fluorine. (1984)

8. Silver chloride is more soluble in very concentrated sodium chloride solution than in pure water. (1984)

9. Solubility of sodium hydroxide increases with increase in temperature. (1985)

10. Sodium when burnt in excess of oxygen gives sodium oxide. (1987).

11. Both potassium ferrocyanide and potassium ferricyanide are diamagnetic. (1989)

12. Cu+ disproportionates to Cu2+. (1991)

13. Nitrous oxide, though an odd electron molecule, is diamagnetic in liquid state. (1991)

14. Diamond is harder than graphite. (1993)

15. The basic nature of the hydroxides of Group 13 (Gr. III B) decreases progressively down the group. (1993)

16. The tendency for catenation is much higher for C than for Si. (1993)

17. HBr is stronger acid than HI because of hydrogen bonding. (1993)

Answers some time later