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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`. |
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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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