Manipal Engineering Manipal Engineering Solved Paper-2008

  • question_answer
    Which of the following electrolyte will have maximum flocculation value for\[Fe{{(OH)}_{3}}\]sol?

    A) \[NaCl\]              

    B)        \[N{{a}_{2}}S\]

    C) \[{{(N{{H}_{4}})}_{3}}P{{O}_{4}}\]           

    D)        \[{{K}_{2}}S{{O}_{4}}\]

    Correct Answer: A

    Solution :

    Flocculation value \[\propto \,\frac{\text{1}}{\text{coagulating}\,\text{power}}\] \[Fe{{(OH)}_{3}}\]is a positively charged sol. To coagulate\[Fe{{(OH)}_{3}}\], negatively charged electrolyte is used and greater the value of negative charge, coagulating power will be strong. Among the given electrolytes,\[NaCl\]has lowest coagulating power, so its flocculation value will be maximum.


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