(b) Sulphur
    (c) Phosphorus
    (d) Silicon
Ans: (b)
8.  Which of the following is the lightest gas?
    (a) Nitrogen
    (b) Hydrogen
    (c) Ammonia
    (d) Carbon dioxide
Ans: (b)
9.  Match the following:
    Alloy                    Composition
    A. Bronze                1. Lead, antimony, tin
    B. Brass                 2. Copper, zinc, nickel
    C. German silver         3. Copper, zinc
    D. Type metal            4. Copper, tin
         A         B         C          D
    (a)  2         1         3          4
    (b)  2         1         4          3
    (c)  3         2         1          4
    (d)  4         3         2          1
Ans: (d)
10. Gobar gas contains mainly:
    (a) methane
    (b) carbon dioxide
    (c) butane
    (d) carbon monoxide
Ans: (a)
11. Match the following: [CDS 1992]
    A. Aluminium             1. Monazite
    B. Uranium               2. Pitch blende
    C.Thorium                3. Bauxite
    D. Lead                  4. Galena
                             5. Haematite
         A         B         C          D
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