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Manipal Medical Manipal Medical Solved Paper-2013

  • question_answer
    \[Ca{{(HC{{O}_{3}})}_{2}}(s)\]decomposes as \[Ca{{(HC{{O}_{3}})}_{2}}(s)\xrightarrow[{}]{{}}CaC{{O}_{3}}(s)+{{H}_{2}}O(g)\] \[+C{{O}_{2}}(g)\]Total pressure at equilibrium is found to be 0.12 bar. Thus,\[{{K}_{p}}\]is

    A)  0.24    

    B)  0.06     

    C)  0.0036  

    D)  0.0144

    Correct Answer: C

    Solution :

     \[Ca{{(HC{{O}_{3}})}_{2}}(s)\xrightarrow[{}]{{}}CaO(s)+C{{O}_{2}}(g)+{{H}_{2}}O & (g)\] Total pressure is due to\[C{{O}_{2}}(g)\]one\[{{H}_{2}}O(g)\] molar ratio being equal. Thus,       \[{{p}_{C{{O}_{2}}}}={{p}_{{{H}_{2}}O}}\] \[{{p}_{C{{O}_{2}}}}={{p}_{{{H}_{2}}O}}=0.06\,bar\] \[{{k}_{p}}={{p}_{C{{O}_{2}}}}\times {{p}_{{{H}_{2}}O}}\] \[=0.06\times 0.06\] \[=0.0036\]


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