NEET Sample Paper NEET Sample Test Paper-15

  • question_answer Chemical [A] is used for softening of water to remove temporary hardness. [A] reacts with sodium carbonates to produce caustic soda. When\[C{{O}_{2}}\]is bubble through [A] it turns cloudy. Chemically [A] is

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

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

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

    D) \[CaO\]   

    Correct Answer: C

    Solution :

    \[\underset{(A)}{\mathop{Ca{{(OH)}_{2}}}}\,+N{{a}_{2}}C{{O}_{3}}\to 2NaOH+CaC{{O}_{3}}\] On passing\[C{{O}_{2}}\]to calcium hydroxide solution. It turns milky due to the formation of \[CaC{{O}_{3}}.\] \[Ca{{(OH)}_{2}}+C{{O}_{2}}\to \underset{\text{Milky}}{\mathop{CaC{{O}_{3}}}}\,+{{H}_{2}}O\] Hence, the correct option is [c].

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