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    Question

    When hard water is evaporated completely, the white

    solid remains in the container. It may be due to the presence of 1. Carbonates of Ca and Mg 2. Sulphates of Ca and Mg 3. Chlorides of Ca and Mg Select the correct answer using the code given below: 
    A 1 and 2 only Correct Answer Incorrect Answer
    B 1, 2 and 3 Correct Answer Incorrect Answer
    C 3 only Correct Answer Incorrect Answer
    D 1 and 3 only Correct Answer Incorrect Answer

    Solution

    The white solid remains in the container when hard water is evaporated completely is mainly due to the presence of carbonates of Ca and Mg and also due to presence of traces of sulphates of Ca and Mg. 

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