Metal which does not react with cold water but reacts with steam to liberate $H_{2}$ gas is :

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Solution

The correct option is D Fe
Na reacts with cold water, Mg reacts with hot water, Fe reacts with steam and Au does not react with water.
$3 F e + 4 H_{2} O \to F e_{3} O_{4} + 4 H_{2}$

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Metal which does not react with cold water but reacts with steam to liberate H2 gas is :

The correct option is D FeNa reacts with cold water, Mg reacts with hot water, Fe reacts with steam and Au does not react with water. 3Fe+4H2O→Fe3O4+4H2

Metal which does not react with cold water but reacts with steam to liberate $H_{2}$ gas is :

The correct option is D Fe
Na reacts with cold water, Mg reacts with hot water, Fe reacts with steam and Au does not react with water.
$3 F e + 4 H_{2} O \to F e_{3} O_{4} + 4 H_{2}$