What do you observe when water is added to calcium hydride?

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Solution

When water is added to calcium hydride( ${CaH}_{2}$ ) hydrogen gas is liberated and calcium hydroxide( $Ca {(OH)}_{2}$ ) formed.
$Ca H subscript 2 and 2 H subscript 2 O yields stack Ca open parentheses O H close parentheses subscript 2 with Calcium space hydroxide below plus 2 H subscript 2 open parentheses upwards arrow close parentheses$

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