JEE Main & Advanced Chemistry Hydrogen & Its Compounds Question Bank Water or hydride of oxygen

  • question_answer Which of the following pair of ions makes the water hard [AMU 2002]

    A) \[N{{a}^{+}},\ SO_{4}^{2-}\]

    B) \[{{K}^{+}},\ HCO_{3}^{-}\]

    C) \[C{{a}^{2+}},\ NO_{3}^{-}\]

    D) \[NH_{4}^{+},\ C{{l}^{-}}\]

    Correct Answer: B

    Solution :

    \[HCO_{3}^{-}\] is main reason of temporary hardness of water.

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