The compound which is used for removing perma | vedclass

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(C) Permanent hardness of water is caused by the presence of dissolved chlorides and sulfates of calcium and magnesium. Sodium carbonate $(Na_{2}CO_{3

Vedclass · Accepted Answer

$Na_{2}CO_{3}$

Vedclass · Answer

(C) Permanent hardness of water is caused by the presence of dissolved chlorides and sulfates of calcium and magnesium. Sodium carbonate $(Na_{2}CO_{3})$,commonly known as washing soda,is used to remove this permanent hardness. It reacts with the calcium and magnesium ions to form insoluble carbonates,which can then be filtered out. The chemical reaction is: $Ca^{2+} + CO_{3}^{2-} \rightarrow CaCO_{3} \downarrow$ and $Mg^{2+} + CO_{3}^{2-} \rightarrow MgCO_{3} \downarrow$. Therefore,$Na_{2}CO_{3}$ is the correct compound.

The compound which is used for removing permanent hardness of water is:

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