CMC Medical CMC-Medical Ludhiana Solved Paper-2011

  • question_answer
    In coagulating the colloidal solution of \[A{{s}_{2}}{{S}_{3}}\] which has the maximum coagulating value?

    A)  \[NaCl\]             

    B)  \[KCl\]

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

    D)  \[AlC{{l}_{3}}\]

    Correct Answer: D

    Solution :

                    According to Hardy-SchuIze rule, the coagulating power of an electrolyte is directly proportional to the valency of active ions. Hence, to coagulate negative sol of \[A{{s}_{2}}{{S}_{3}},\] the coagulating power of different cations decrease as\[A{{l}^{3+}}>B{{a}^{2+}}>N{{a}^{+}}\]


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