Q.

Which one of the following processes will produce hard water?

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a

Saturation of water with CaCO3

b

Saturation of water with MgCO3

c

Saturation of water with CaSO4

d

Addition of Na2SO4 to water

answer is C.

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Detailed Solution

Saturation of water with CaSO4
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Which one of the following processes will produce hard water?