AFMC AFMC Solved Paper-2008

  • question_answer
    Which of the following electrolytes will have maximum flocculation value for \[\text{Fe(OH}{{\text{)}}_{3}}\] 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 :

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


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