Hydrogen readily combines with which of these elements?

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Solution

The correct options are
A Na
B K
C Zn
D Ca
$H_{2}$ easily reacts with Na,Ca,K as they are highly reactive metals and are placed at the top of the reactivity series.

$2 N a + H_{2} \to 2 N a H$
$2 K + H_{2} \to 2 K H$
$C a + H_{2} \to C a H_{2}$

The reaction of excited zinc atoms with molecular hydrogen in the gas phase and Molecular zinc hydride in the gas phase was found to be linear with a Zn-H bond length of 153.5 pm .

$Z n + H_{2} \to Z n H_{2}$

Hence , all options are correct .

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