164. Solder is an alloy of
     (a) tin and copper
     (b) tin and lead
     (c) tin and zinc
     (d) tin, copper and zinc
Ans: (c)
165. Calomel is
     (a) lead chloride
     (b) mercurous chloride
     (c) mercuric chloride
     (d) calcium sulphate
Ans: (b)
166. Match the following:
     List-I                   List-II
     A. Solder                1. alloy of copper and tin
     B. Brass                 2. alloy of aluminium
     C. Duralumin             3. alloy of tin and lead
     D. Bronze                4. alloy of copper and zinc
           A        B         C          D
     (a)   3        4         2          1
     (b)   3        2         4          1
     (c)   1        4         3          2
     (d)   1        3         2          4
Ans: (a)
167. Match the following:
     List-I                              List-II
     A. Production of hydrogen           1. silver amalgam
     B. Electrode                        2. sodium amalgam
     C. Making of mirror                 3. zinc amalgam
     D. Used in dentistry                4. tin amalgam
           A        B         C          D
     (a)   2        4         1          3
     (b)   3        2         1          4
     (c)   2        3         4          1
     (d)   3        4         1          2
Ans: (c)
168. Which of the following is not an alloy of copper?
     (a) Bronze
     (b) Brass
     (c) Solder
     (d) Gun metal
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