What happens when Calcium reacts with water?

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Solution

Generally metals reacts with water ( $H_{2} O$ ) and gives the respective metal hydroxide.
For example Calcium ( $C a$ ) reacts with water and forms Calcium hydroxide ( $Ca {(OH)}_{2}$ ) and Hydrogen ( $H_{2}$ ) as the products.
The balanced chemical reaction is as follows.
$\underset{Calcium}{Ca (s)} + \underset{Cold Water}{2 H_{2} O (l)} \to \underset{Calcium hydroxide}{Ca {(OH)}_{2} (s)} + \underset{Hydrogen}{H_{2} (g)}$

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