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NEET Sample Paper NEET Sample Test Paper-10

  • 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, it turns cloudy. What is A?

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

    B)  \[CaO\]

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

    D)  \[Ca{{(HC{{O}_{3}})}_{2}}\]

    Correct Answer: C

    Solution :

    \[\underset{(A)}{\mathop{Ca{{(OH)}_{2}}}}\,+Ca{{(HC{{O}_{3}})}_{2}}\xrightarrow{{}}2CaC{{O}_{3}}\downarrow +{{H}_{2}}O\]Temporary hardness of water is removed by \[Ca{{(OH)}_{2}}\]. It converts bicarbonates into insoluble calcium and magnesium carbonate which are removed by filteration \[\underset{(A)}{\mathop{Ca{{(OH)}_{2}}}}\,+N{{a}_{2}}C{{O}_{3}}\xrightarrow{{}}CaC{{O}_{3}}+\underset{Caustic\,\,Soda}{\mathop{2NaOH}}\,\] \[Ca{{(OH)}_{2}}+2C{{O}_{2}}\xrightarrow{{}}\underset{Cloudy}{\mathop{Ca{{\left( HC{{O}_{3}} \right)}_{2}}}}\,\]


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