Name a metal which forms an oxide on exposure to air.

Sodium

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Zinc

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None

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Solution

The correct option is A Sodium
Sodium metal reacts with the oxygen of the air at room temperature to form sodium oxide. Hence, sodium is stored under kerosene to prevent its reaction with oxygen, moisture and carbon dioxide.

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(b) a nitrate which on heating leaves no residue behind.

(d) a metal nitrate which on heating is changed into metal.

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