CMC Medical CMC-Medical VELLORE Solved Paper-2010

  • question_answer
    Which of the following groups of ions will make the water hard?

    A)  Sodium and bicarbonate

    B)  Magnesium and sulphate

    C)  Potassium and sulphate

    D)  Ammonium and chloride

    E)  None of the above

    Correct Answer: B

    Solution :

                    The hardness of water is due to the presence of bicarbonates, chlorides and sulphates of calcium and magnesium in it.


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