First slide

Hydrogen

Question

Metal which does not react with cold water but evolves $H_{2}$ with steam is

Moderate

A

Fe
B

K
C

Pt
D

Na

Solution

$\underset{Red hot}{3 Fe} + 4 H_{2} O (v) \overset{}{\to} {Fe}_{3} O_{4} + 4 H_{2}$

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