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

Which of the following is a non metal that remains liquid at room temperature?

A. Phosphorous B. Bromine
C. Chlorine D. Helium

Chlorophyll is a naturally occurring chelate compound in which central metal is

A. copper B. magnesium
C. iron D. calcium

Which of the following is used in pencils?

A. Graphite B. Silicon
C. Charcoal D. Phosphorous

Which of the following metals forms an amalgam with other metals?

A. Tin B. Mercury
C. Lead D. Zinc

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