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  4. A metal which does not react with cold water but reacts with steam to liberate H2 gas is

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Q. A metal which does not react with cold water but reacts with steam to liberate $H_2$ gas is

Hydrogen

Solution:

$Na$ reacts with cold water, $Mg$ reacts with hot water, $Fe$ reacts with steam and $Au$ does not react with water.
$3Fe +\underset{\text{(steam)}}{4H_2O}\rightarrow Fe_3O_3 +4H_2 \uparrow$