Assertion (A): soaps are not suitable for washing purpose when water is hard.

Reason (R): soaps have relatively weak cleansing action

Dear student,

Assertion statement is correct but the reason is incorrect. 
Soap is not used for cleaning with hard water because soap reacts with calcium and magnesium present in hard water and causes scum formation. This avoids the formation of lather and hence cannot help in cleaning.
Thus the answer is Assertion is true but reason is false.

Regards