Question

    The two metal ions that cause hardness to water

    are……………?
    A Calcium and Magnesium Correct Answer Incorrect Answer
    B Sodium and Magnesium Correct Answer Incorrect Answer
    C Magnesium and Sulphur Correct Answer Incorrect Answer
    D Sodium and Chlorine Correct Answer Incorrect Answer

    Solution

    Hardness is defined as the concentrations of calcium and magnesium ions expressed in terms of calcium carbonate.The Hardness in water is caused by the presence of dissolved calcium (Ca 2+) and magnesium (Mg 2+) ions.

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