(a)  4         3         2         1
    (b)  1         3         2         4
    (c)  4         2         1         3
    (d)  2         1         3         4
Ans: (a)
91. Match the following:
    A. Chile saltpetre       1. Mercury
    B. Fluorspar             2. Zinc
    C. Calamine              3. Sodium
    D. Cinnabar              4. Calcium
         A         B         C         D
    (a)  3         4         2         1
    (b)  3         4         1         2
    (c)  2         1         4         3
    (d)  2         3         4         1
Ans: (a)
92. Match the following:
    A. Magnesium             1. Dolomite
    B. Calcium               2. Bauxite
    C. Aluminium             3. Limestone
    D. Uranium               4. Pitchblende
         A         B         C         D
    (a)  2         3         4         1
    (b)  1         3         2         4
    (c)  2         3         1         4
    (d)  2         1         4         3
Ans: (b)
93. Match the following:
    A. Hydrogen 1. The most abundant element on the earth
    B. Oxygen      2. The most abundant element in the universe
    C. Nitrogen    3. Constituent of plant and animal proteins
                   4. Used as a bleaching agent
         A         B         C
    (a) 1          2         4
    (b) 3          2         1
    (c) 2          1         3
                                                             372