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Which one of the following processes will produce hard water? (a) Saturation of water with CaCO3

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Which one of the following processes will produce hard water?
(a) Saturation of water with CaCO3
(b) Saturation of water with MgCO3
(c) Saturation of water with CaSO4
(d) Addition of Na2SO4 to water.

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Best answer

Correct option(c) Saturation of water with CaSO4

Explanation:

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