CHEMISTRY QUIZ :
1 . Brass gets discoloured in air because of the presence of which of the following gases in air ? A . Oxygen
B . Hydrogen sulphide C .
Carbon dioxide D . Nitrogen
2 . Which of the following is a non metal that remains liquid at room temperature ? A . Phosphorous
B . Bromine C .
Chlorine D . Helium
3 . Chlorophyll is a naturally occurring chelate compound in which central metal is A . copper
B . magnesium C . iron D . calcium
4 . Which of the following is used in pencils ? A . Graphite
B . Silicon C .
Charcoal D . Phosphorous
5 . Which of the following metals forms an amalgam with other metals ? A . Tin
B . Mercury C .
Lead
D . Zinc
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