Select the correct statement.

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(B) $1$. Calcium bicarbonate $(Ca(HCO_3)_2)$ is responsible for temporary hardness,not permanent hardness. So,option $A$ is incorrect.$2$. Hydrogen pe

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$H_2O_2$ is diamagnetic.

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(B) $1$. Calcium bicarbonate $(Ca(HCO_3)_2)$ is responsible for 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 $Ca^{2+}$ and $Mg^{2+}$ ions,not anion exchange. So,option $C$ is incorrect.$4$. Since only option $B$ is correct,option $D$ is incorrect.

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