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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 remain in liquid for under normal conditions?
A.
Radium
B. Zinc
C. Uranium
D. Mercury




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