Correct Answer: Option A

Explanation

Permanent hardness in water= Mg & Ca Sulphate.
Temporary hardness in water= Mg & Ca Carbonate.

Temporary hardness of water is caused by Magnesium and calcium hydrogencarbonate. It is formed when rainwater containing dissolved CO₂ flows over deposit of CaCO₃

i.e CaCO₃ + CO₂ + H₂O → Ca(HCO₃)₂

There is an explanation video available below.

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