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  4. Permutit is technical name given to

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Q. Permutit is technical name given to

Hydrogen

Solution:

Permanent hardness is removed by precipitating carbonates of $Ca^{+2}$ and $Mg^{+2}$
$CaCl_2 + Na_2CO_3 \rightarrow CaCO_3 \downarrow + 2NaCl$