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

  • question_answer Match list I with list II and select the correct answer using the codes given below the lists [SCRA 2001]
    List I List II
    1. Heavy water  Bicarbonates of Mg and Ca in water
    2. Temporary hard water  No foreign ions in water
    3. Soft water  \[{{D}_{2}}O\]
    4. Permanent hard water  Sulphates and chlorides of Mg and Ca in water

    A) 1-c, 2-d, 3-b, 4-a

    B) 1-b, 2-a, 3-c, 4-d

    C) 1-b, 2-d, 3-c, 4-a

    D) 1-c, 2-a, 3-b, 4-d

    Correct Answer: D

    Solution :

    Heavy water is \[{{D}_{2}}O\] (1 - c) Temporary hard water contains bicarbonates of \[C{{a}^{2+}}\] and \[M{{g}^{2+}}(2-a)\] Soft water may have no foreign ions\[(3-b)\]. Permanent hard water contains sulphates and chlorides of \[C{{a}^{+2}}\] and \[M{{g}^{2+}}(4-d)\]

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