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CET Karnataka Medical CET - Karnataka Medical Solved Paper-2014

  • question_answer
    One mole of ammonia was completely absorbed in one litre solution each of (1)\[1M\text{ }HCl\], (2) \[1M\text{ }C{{H}_{3}}COOH\]and (3) \[1M\text{ }{{H}_{2}}S{{O}_{4}}\]at 298 K. The decreasing order for the pH of the resulting solutions is          (Given: \[{{K}_{b}}(N{{H}_{3}})=4.74\])

    A)  \[2>3>1\]

    B)  \[1>2>3\]

    C)  \[2>1>3\]

    D)  \[3>2>1\]

    Correct Answer: C

    Solution :

    : \[\begin{align}   & \xrightarrow[C{{H}_{3}}COOH>HCl>{{H}_{2}}S{{O}_{4}}]{Decra\sin g\,\,order\,of\,pH} \\  & \xrightarrow[Increa\sin g\,\,acidic\,strength]{\,\,\,\,\,(2)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1)\,\,\,\,\,\,\,\,\,\,\,\,\,(3)\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ \end{align}\]


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