C. LPG                    3. Methane, Ethane
    D. Water Gas              4. Hydrogen, Methane, Carbon monoxide
         A          B         C        D
    (a)  2          1         3        4
    (b)  3          4         2        1
    (c)  2          4         3        1
    (d)  3          1         2        4
Ans: (b)
82. Salts of which of the following elements provide colours to fireworks? [IAS 2004]
    (a) Zinc and sulphur
    (b) Potassium and mercury
    (c) Strontiurn and barium
    (d) Chromium and nickel
Ans: (c)
83. Standard 18-carat gold sold in the market contains: [IAS 2004]
    (a) 82 parts gold and 18 parts other metals
    (b) 18 parts gold and 82 parts other metals
    (c) 18 parts gold and 6 parts other metals
    (d) 9 parts gold and 16 parts other metals
Ans: (c)
84. Consider the following statements: [lAS2004]
    1) Baking soda is used in fire extinguishers.
    2) Quicklime is used in the manufacture of glass.
    3) Gypsum is used in the manufacture of Plaster of Paris.
    Which of the statements given above is/are correct? .
    (a)  1 and 2
    (b)  2 and 3
    (c)  1 only
    (d)  1, 2 and 3
Ans: (d)
85. Acetyl salicylic acid is commonly used as :
    (a) a pain killer
    (b) a sedative
    (c) a fertiliser
    (d) tear gas
Ans: (a)
86. During the fermentation of sugar, the enzyme which converts glucose into ethyl alcohol is:
    (a) invertase
    (b) diastase
    (c) zymase
    (d) maltase
Ans: (c)
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