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Which will produce hard water ?A. Saturation og water with `CaSO_4`B. Addition of `Na_2SO_4` to waterC. Saturation of water with `CaCO_3`D. Saturation of water with `MgCO_3`.

Answer» Correct Answer - A
`Ca^(2+)` and `Mg^(2+)` ions are responsible for hardness. Also `CaSO_4` is soluble in water to an appreciable amount.


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