The acidity of calcium hydroxide is___________.

2

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Solution

The correct option is D $2$
Calcium hydroxide $C a (O H)_{2}$ on its dissociation gives two hydroxide ions which make the medium acidic in nature.

$C a (O H)_{2} \to C a^{+ 2} + 2 (O H^{- 1})$

The $2 (O H)^{- 1}$ (hydroxide ions) results in the acidity of the medium.

Hence, the acidity of $C a (O H)_{2}$ is 2.

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Write the following in the form of a word equation:

$2 N a O H + C a B r_{2} \to C a (O H)_{2} + 2 N a B r$

In the formula $C a B r_{2}$ what does $C a$ stand for and what is its valency?

\to

C a B r_{2}

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