16. Which of the following substances is a bad conductor of electricity but a good conductor of heat ?
(a) Mica
(b) Perspex
(c) Celluloid
(d) Asbestos
Explanation
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17. Which of the following is a non metal that remains liquid at room temperature?
(a) Phosphorous
(b) Bromine
(c) Chlorine
(d) Helium
Explanation
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18. Chlorophyll is a naturally occurring chelate compound in which central metal is
(a) copper
(b) magnesium
(c) iron
(d) calcium
Explanation
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19. Which of the following metals forms an amalgam with other metals?
(a) Tin
(b) Mercury
(c) Lead
(d) Zinc
Explanation
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20. Which of the following is used in pencils?
(a) Graphite
(b) Silicon
(c) Charcoal
(d) Phosphorous
Explanation
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