JEE Main & Advanced Chemistry Hydrogen & Its Compounds Question Bank Hydrogen

  • question_answer Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When \[C{{O}_{2}}\] is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A [Pb. CET 1990; AIIMS 1999]

    A) \[CaC{{O}_{3}}\]

    B) CaO

    C) \[Ca{{(OH)}_{2}}\]

    D) \[Ca{{(HC{{O}_{3}})}_{2}}\]

    Correct Answer: C

    Solution :

    \[Ca{{(OH)}_{2}}\] is used for the softening of temporary hard water. \[Ca{{(OH)}_{2}}(aq)+C{{O}_{2}}(g)\to \underset{\text{cloudiness}}{\mathop{CaC{{O}_{3}}(s)}}\,+{{H}_{2}}O(l)\]

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