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Important questions on Dioxygen

Oxygen can be prepared by heating ___________.

A
potassium permanganate
B
methane
C
carbon
D
none of these
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Oxygen gas is not produced from the following decomposition reaction :

A
B
C
D
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Oxygen can be obtained from bleaching powder by:

A
adding dilute acid
B
passing carbon dioxide
C
heating with a cobalt salt
D
adding alkalies
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is the symbol of ........ion

A
Oxide
B
Superoxide
C
peroxide
D
Monoxide
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