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  4. In Clark's method, the chemical used to remove hardness of water is-

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Q. In Clark's method, the chemical used to remove hardness of water is-

Hydrogen

Solution:

$Ca \left( HCO _{3}\right)_{2}+ Ca ( OH )_{2} \rightarrow 2 CaCO _{3}+2 H _{2} O ( l )$