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

  • question_answer Which one of the following removes temporary hardness of water

    A) Slaked lime

    B) Plaster of Paris

    C) Cuprous

    D) Hydrolith

    Correct Answer: A

    Solution :

    Slaked lime removes temporary hardness of water. \[Ca{{(OH)}_{2}}+\underset{\text{From hard water}}{\mathop{Ca{{(HC{{O}_{3}})}_{2}}}}\,\to 2CaC{{O}_{3}}\downarrow +2{{H}_{2}}O\]


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