A student was given few metals Mg, K, Fe and Cu. Which of them will react only with steam and not with cold or hot water to give $H_{2}$ gas?

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Solution

The correct option is C Fe
Iron (Fe) does not react with hot or cold water. It only reacts with steam to give hydrogen gas.
Magnesium (Mg) does not react with cold water but reacts with hot water to give hydrogen gas.
Potassium (K) reacts violently with cold water to give hydrogen gas.
Copper (Cu) does not react with hot/cold water or steam.

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A student was given few metals Mg, K, Fe and Cu. Which of them will react only with steam and not with cold or hot water to give H2 gas?

A student was given few metals Mg, K, Fe and Cu. Which of them will react only with steam and not with cold or hot water to give $H_{2}$ gas?