In the following pair of compounds, ionic and covalent hydrides are, respectively:

C a H_{2}, S i H_{4}

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S i H_{4}, B_{2} H_{6}

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L i H, N a H

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B_{2} H_{6}, N a H

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Solution

The correct option is A $C a H_{2}, S i H_{4}$
Ionic hydrides or saline hydrides $\to$ These are formed by the combination of hydrogen with IA & IIA metals (highly reactive metals).
eg.- $L i H, N a H, K H, C a H_{2}$ etc.
Covalent Hydrides
$\to$ Compounds of hydrogen with non-metals and elements of comparable electronegativity like B and Si.
eg.- $S i H_{4}, B_{2} H_{6}$

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