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Question

Which of the following processes will produce hard water?

A
Saturation of water with CaCO3
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B
Saturation of water with MgCO3
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C
Saturation of water with CaSO4
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D
Addition of NaSO4 to water
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Solution

The correct option is C Saturation of water with CaSO4
Saturation of water with ​
CaSO4/MgSO4/CaCl2/MgCl2 makes the water hard

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