(d) ammonium persulphate
Ans: (b)
56. Match the following: [NDA 1993]
Process Changes
A. Evaporation 1. Liquid into gas
B. Sublimation 2. Gas into liquid
C. Freezing 3. Solid into gas
D. Melting 4. Solid into liquid
5. Liquid into solid
A B C D
(a) 1 2 4 3
(b) 3 1 2 4
(c) 2 1 4 3
(d) 2 1 3 4
Ans: (d)
57. Which of the following causes the rusting of iron? [NDA 1995]
1) Oxidation
2) Reduction
3) Chemical reaction with oxygen
4) Chemical reaction with CO2
(a) 1 and 2
(b) 2 and 3
(c) 3 and 4
(d) 1 and 3
Ans: (c)
58. Which of the following statements is/are true? [NDA 1994]
1) The process of oxidation leads to a gain of electrons.
2) The process of oxidation leads to a loss of electrons.
3) The process of reduction leads to a gain of electrons.
4) The process of reduction leads to a loss of electrons.
(a) 1 only
(b) 1 and 4
(c) 2 and 3
(d) 4 only
Ans: (c)
59. Match the following: [IFS 1989]
Process Materials obtained
A. Hydrogenation 1. Vanaspati
B. Evaporation 2. Ethyl alcohol
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