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CMC Medical CMC-Medical VELLORE Solved Paper-2012

  • question_answer
    A solid compound \[X\] on heating gives \[C{{O}_{2}}\]gas and a residue. The residue mixed with water to give \[Y\]. On passing an excess of \[C{{O}_{2}}\]through \[Y\] in water clear solution \[Z\] is obtained. On boiling \[Z\] compound \[X\] is reformed. The compound \[X\] is

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

    B)  \[CaC{{O}_{3}}\]

    C)  \[N{{a}_{2}}C{{O}_{3}}\]                             

    D)  \[{{K}_{2}}C{{O}_{3}}\]

    Correct Answer: B

    Solution :

                    Compound X is \[CaC{{O}_{3}}\]. \[\underset{X}{\mathop{CaC{{O}_{3}}}}\,\xrightarrow{\Delta }\underset{residue}{\mathop{CaO}}\,+C{{O}_{2}}\uparrow \] \[\underset{residue}{\mathop{CaO}}\,+{{H}_{2}}O\xrightarrow{{}}\underset{Y}{\mathop{Ca{{(OH)}_{2}}}}\,\] \[\underset{Y}{\mathop{Ca{{(OH)}_{2}}}}\,+\underset{excess}{\mathop{C{{O}_{2}}}}\,+{{H}_{2}}O\xrightarrow{{}}\underset{Z}{\mathop{Ca{{(HC{{O}_{3}})}_{2}}}}\,\] \[Ca{{(HC{{O}_{3}})}_{2}}\xrightarrow{\Delta }\underset{X}{\mathop{CaC{{O}_{3}}}}\,+{{H}_{2}}O+C{{O}_{2}}\uparrow \]


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