Water softening by Clark's process uses:

calcium bicarbonate

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sodium bicarbonate

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potash alum

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calcium hydroxide

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Solution

The correct option is D calcium hydroxide
Water softening by Clarke's process uses calcium hydroxide (lime). It removes temporary hardness. $C a (H C O_{3})_{2} + C a (O H)_{2} \to 2 C a C O_{3} + 2 H_{2} O$ .

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Water softening by Clark’s process uses

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