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Assertion: Calgon is used for removing C...

Assertion: Calgon is used for removing `Ca^(2+) and Mg^(2+)` ions from hard water. Reason: Calogon forms precipatate with `Ca^(2+) and Mg^(2+)` ions.

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(d) Correct assertion: Calgon makes `Ca^(2+) and Mg^(2+)` ions present in hard water ineffective.
Correct reason: Calogon forms soluble complex with `Ca^(2+) and Mg^(2+) ions`.
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