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Permanent hardness of water can be remov...

Permanent hardness of water can be removed by

A

heating

B

treating with sodium acetate `(CH_3CO_2Na)`

C

treating with `Ca(HCO_3)_2`

D

treatment with sodium hexametaphosphate `(Na_6P_6O_18)`

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KVPY PREVIOUS YEAR-SOLVED PAPER 2019-EXAMPLE
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