Select the correct statement :-

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(B) $1$. Calcium bicarbonate $(Ca(HCO_3)_2)$ causes temporary hardness,not permanent hardness. So,option $A$ is incorrect.$2$. Hydrogen peroxide $(H_2

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$H_2O_2$ is diamagnetic

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(B) $1$. Calcium bicarbonate $(Ca(HCO_3)_2)$ causes temporary hardness,not permanent hardness. So,option $A$ is incorrect.$2$. Hydrogen peroxide $(H_2O_2)$ has a non-planar structure and all its electrons are paired,making it diamagnetic. So,option $B$ is correct.$3$. The Calgon method uses sodium hexametaphosphate $(Na_6P_6O_{18})$ to sequester calcium and magnesium ions,not anion exchange. So,option $C$ is incorrect.$4$. Since only option $B$ is correct,option $D$ is incorrect.

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