Question

Select from the following salts which may be used to prepare hard water
A. CaSO4
B. Na2SO4
C. CaCl2
D. K2SO4
E. NaHCO3
F. MgCl2

1. A, B and D
2. A, C and F
3. B, D and E
4. C, E and F

Answer 1

2 option
hope its help you

Answer 2

The salts which contain calcium and magnesium are used to prepare hard water.
So,answer us CaSO4,CaCl2 and MgCl2.
So,option is (2)A,C and F
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