Temporary hardness may be removed from water by adding

$C a C O_{3}$

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$C a$ $(O H)_{2}$

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$C a$ $S O_{4}$

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$H C l$

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Solution

The correct option is B
$C a$ $(O H)_{2}$

$C a$ ( $H C O_{3})_{2}$ is responsible for the temporary hardness of water which can be removed in the form of $C a C O_{3}$ by adding $C a$ ( $H O)_{2}$ .

$C a$ ( $H C O_{3})_{2}$ + $C a$ ( $H O)_{2}$ $\to$ 2 $C a C O_{3}$ (ppt.) $↓$ + 4 $H_{2}$ $O$

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Temporary hardness may be removed from water by adding

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