The reagent (s) that can be used for softening the temporary hardness of water is (are)

ion exchange resins

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C a (O H)_{2}

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N a_{6} P_{6} O_{18}

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None of the above

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Solution

The correct option is B $C a (O H)_{2}$
Temporary hardness due to bicarbonates of calcium and magnesium. Temporary hardness can be removed by Clark's proces, which involves the addition of slaked lime, $C a (O H)_{2}$ .
$C a (H C O_{3}) + C a (O H)_{2} \to 2 C a C O_{3} ↓ + 2 H_{2} O$

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