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

N a

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M g

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A u

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F e

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Solution

The correct option is D $F e$
Na reacts with cold water, $M g$ reacts with hot water, $F e$ reacts with steam and $A u$ 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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A 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

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

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