The coagulation values in milimoles per litre of the electrolyte used for the coagulation of $A s_{2} S_{3}$ are given below
$I .$ (NaCl) = 52,
$I I .$ $(B a C l_{2}) = 0.69,$
$I I I .$ $(M g S O_{4}) = 0.22$
The correct order of the coagulation power is

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Coagulating power ∝ 1 C o a g u l a t i o n v a l u e Lower the coagulation value, higher is the coagulating power so, the correct order is M g S O 4 ( I I I ) > B a C l 2 ( I I ) > N a C l ( I )

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