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NEET Sample Paper NEET Sample Test Paper-23

  • question_answer
    Hardness of water is due to the presence of salts of

    A)  \[C{{a}^{2+}}\]and \[{{K}^{+}}\]                   

    B)  \[C{{a}^{2+}}\]and\[M{{g}^{2+}}\]

    C)  \[N{{a}^{+}}\]and\[{{K}^{+}}\]                      

    D)  \[C{{a}^{2+}}\]and\[N{{a}^{+}}\] 

    Correct Answer: B

    Solution :

    Hardness of\[{{H}_{2}}O\] is due to the presence of bicarbonates, chlorides and sulphates of Ca and Mg ions. Hence, the correct option is [b].


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