Assertion (A): Permanent hardness of water is removed by treatment with washing soda.
Reason (R) : Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.

Options

A. Statements (A) and R both are correct and (R) is the correct explanation of (A)
B. (A) is correct but (R) is not correct
C. (A) and R both are correct but (R) is not the correct explanation of (A)
D. (A) and (R) both are false

Answer

A

Explanation

Statements of assertion and reason both are correct and reason is the correct explanation of assertion.
`Na_2CO_3+ underset"(form hard water)"underset(CaSO_4)underset"or"(MgSO_4) to Na_2SO_4 + underset"(insoluble)"underset(CaCO_3) underset"or"(MgCO_3)`