Permanent hardness of water can be removed by adding: (a) \( \mathr...

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Permanent hardness of water can be removed by adding:
(a) \( \mathrm{Na}_{2} \mathrm{CO}_{3} \)
(b) \( \mathrm{K} \)
(c) \( \mathrm{Ca}(\mathrm{OCl}) \mathrm{Cl} \)
\( \mathrm{PV} \)
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