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Temporary hardness of water is due to the more solubility of bicarbonates of Ca, Mg in water
than their carbonates

Temporary hardness of water is removed by boiling due to the less thermal stability of bicarbonates
than carbonates

In the removal of permanent hardness of water by permatite process, adsorption of cations takes
place

All anions and cations are completely removed during softening of hard water by Ion-Exchange
process

answer is A.

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Detailed Solution

Calcium and magnesium ions and they salts make the water hard.All are correct facts.

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