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Which of the following grouups of ioins makes the water hard ?A. Sodium and bicarbonateB. Magnesium and chlorideC. Potassium and sulphateD. Ammonium and chloride |
Answer» Correct Answer - B<br>Temporary hardness is due to the presence of bicarbonates of calcium and magnesium and permanent hardness is due to the sulphates or chlorides of both of calcium and magnesium. | |