The valency of calcium in calcium hydroxide is ___ .

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Solution

Calcium hydroxide = $C a (O H)^{2}$
Each (OH) ion has one net negative charge as oxygen has a valency of -2 and hydrogen has a valency of +1.
Now, as calcium hydroxide is a neutral compound, so it is possible only when calcium has a net positive charge of +2.
So, valency of calcium in $C a (O H)^{2}$ is 2.
Also, $C a (O H)^{2} ⟶ C a^{2 +} + 2 (O H)^{-}$

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