First slide

Water and Heavy water

Question

The pair that yields the same gaseous product on reaction with water

Moderate

A

$K and {KO}_{2}$
B

$Ca and {CaH}_{2}$
C

$Na and {Na}_{2} O_{2}$
D

$Ba and {BaO}_{2}$

Solution

$Ca + 2 H_{2} O \overset{}{\to} Ca {(OH)}_{2} + H_{2} {CaH}_{2} + 2 H_{2} O \overset{}{\to} Ca {(OH)}_{2} + H_{2}$

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