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Question

Water softening by Clark's  process uses:


A
calcium bicarbonate
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B
sodium bicarbonate
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C
potash alum
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D
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. $$Ca(HCO_3)_2+Ca(OH)_2 \rightarrow 2CaCO_3+ 2H_2O$$.

Chemistry

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