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Question

A metal 'X' reacts readily with the oxygen in the air but does not react with cold or hot water. The metal 'X' can be:

A
sodium
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B
magnesium
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C
potassium
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D
iron
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Solution

The correct option is D iron
Sodium and potassium are highly reactive metals which reacts readily with oxygen and cold water. Magnesium is also a reactive metal which reacts with oxygen but does not reacts with cold water. It reacts with hot water.

Among the given metals, only iron is the metal which reacts with oxygen but does not reacts with cold or hot water. It reacts only with steam at high temperature.

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