56. Which of the following is used as a lubricant?
(a) Graphite
(b) Silica
(c) Iron Oxide
(d) Diamond
57. Potassium nitrate is used in
(a) medicine
(b) fertiliser
(c) salt
(d) glass
58. Galvanised iron sheets have a coating of
(a) lead
(b) chromium
(c) zinc
(d) tin
59. Among the various allotropes of carbon,
(a) coke is the hardest, graphite is the softest
(b) diamond is the hardest, coke is the softest
(c) diamond is the hardest, graphite is the softest
(d) diamond is the hardest, lamp black is the softest
60. Marsh gas is
(a) nitrogen
(b) ethane
(c) methane
(d) hydrogen
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