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Q.

Water softening by Clarke's process does not use:

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a

calcium hydroxide

b

calcium bicarbonate

c

potash alum

answer is A, B, C.

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Detailed Solution

Water softening by Clarke's cycle utilizes calcium hydroxide (lime). It eliminates temporary hardness.

Ca(HCO3)2+Ca(OH)2→2CaCO3+2H2O.

Hence, options A, B, and C are correct.

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