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CMC Medical CMC-Medical VELLORE Solved Paper-2010

  • question_answer
    Arsenic sulphide sol is negatively charged. Which of the following electrolytes would be most effective in its coagulation?

    A)  \[BaC{{l}_{2}}\]                               

    B)  \[NaCl\]

    C)  \[MgS{{O}_{4}}\]                           

    D)  \[AlC{{l}_{3}}\]

    E)  None of these

    Correct Answer: D

    Solution :

                   
    Arsenic sulphide (-) Sol
    Electrolyte Coagulating value
    \[BaC{{l}_{2}}\] 0.69
    \[NaCl\] 51
    \[MgS{{O}_{4}}\] 0.72
    \[AlC{{l}_{3}}\] 0.093
    \[\text{Coagulating}\,\text{power}\propto \frac{\text{1}}{\text{coagulating}\,\text{value}}\] Hence, \[AlC{{l}_{3}}\] is most effective in coagulation of negative sol of\[A{{s}_{2}}{{S}_{3}}\].


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