What is the correct sequence of the increasing effectiveness of the following electrolyte for the coagulation of ferric hydroxide sol?
$K_{4} [F e (C N)_{6}]$
$A l P O_{4}$
$C a S O_{4}$
$S n C l_{4}$
Select the correct answer using the codes given below:

d,b,a,c

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d,c,b,a

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a,b,c,d

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c,d,b,a

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Solution

The correct option is A d,b,a,c
Ferric hydroxide sol is positively charged.
Hence, more the negative charge of electrolyte, more is its effectiveness in coagulation.
$S n C l_{4}$ has $4 C l^{-}$ ions, $A l P O_{3}$ has $P O_{4}^{3 -}$ ion, $K_{4} [F e (C N)_{6}]$ has $[F e (C N)]^{4 -}$ ion, $C a S O_{3}$ has $S O_{4}^{2 -}$ ion.
$∴$ Order of effectiveness:-
$S n C l_{4} > A l P O_{4} > K_{4} [F e (C N)_{6}] > C a S O_{4}$ or $d > b > a > c$ .

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