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AIIMS AIIMS Solved Paper-2008

  • question_answer
    On adding 0.1 M solution each of \[\therefore \] \[KCl=-{{3}^{o}}C\] in a \[SC{{l}_{4}}\] solution, species first precipitated is \[({{H}_{2}}S{{O}_{3}})\]\[\underset{1}{\mathop{S}}\,+\underset{2}{\mathop{2C{{l}_{2}}}}\,\xrightarrow{{}}\underset{(X)}{\mathop{SC{{l}_{4}}}}\,\],

    A)  \[SC{{l}_{4}}+4{{H}_{2}}O\xrightarrow{{}}S{{(OH)}_{4}}+4HCl\]                

    B)  \[S{{(OH)}_{4}}\xrightarrow[{}]{}\underset{\underset{(Y)}{\mathop{sulphurous\,acid}}\,}{\mathop{{{H}_{2}}S{{O}_{3}}}}\,+{{H}_{2}}O\]               

    C)         \[SO_{3}^{2-}.\]          

    D)         All of these

    Correct Answer: B

    Solution :

    Solubility of \[+7,+5,+3\]                                           \[-x\] Solubility of \[-y\]                                             \[(-x-y+z)kJ\] Solubility of \[(-z-x+2y)kJ\] (\[(-x-2y-z)kJ\]For \[(-x-2y+z)kJ\]) \[{{I}_{2}}\] Least solubility is of \[{{C}_{2}}{{H}_{5}}OH\] hence it will precipitate first.


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