WB JEE Medical WB JEE Medical Solved Paper-2007

  • question_answer
    A compound X on heating gives a colourless gas. This residue is dissolved in water to obtain Y. Excess \[C{{O}_{2}}\]is bubbled through aqueous solution of Y when Z is formed. Z on gentle heating gives back X. The X is

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

    B)  \[Ca{{(HC{{O}_{3}})}_{2}}\]

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

    D)  \[NaHC{{O}_{3}}\]

    Correct Answer: A

    Solution :

                     \[\underset{(X)}{\mathop{CaC{{O}_{3}}}}\,\xrightarrow{\Delta }CaO+C{{O}_{2}}\] \[CaO+{{H}_{2}}O\to \underset{(Y)}{\mathop{Ca{{(OH)}_{2}}}}\,\] \[Ca{{(OH)}_{2}}+2C{{O}_{2}}\to \underset{(z)}{\mathop{Ca{{(HC{{O}_{3}})}_{2}}}}\,\] \[Ca{{(HC{{O}_{3}})}_{2}}\xrightarrow{\Delta }\underset{(X)}{\mathop{CaC{{O}_{3}}}}\,+C{{O}_{2}}+{{H}_{2}}O\]


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