Which one of the following process will produce hard water?[AIEEE 2003]

Question

Which one of the following process will produce hard water?

[AIEEE 2003]

Accepted Answer

Correct Answer is : Saturation of water with CaSO4

Answer

Saturation of water with MgCO3

Answer

Saturation of water with CaSO4

Answer

Addition of Na2SO4 to water

Answer

Saturation of water with CaCO3

AIEEE 2003 Chemistry Solved Paper