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Whịch of the following electrolyte will ...

Whịch of the following electrolyte will have maximum flocculation -value of `Fe(OH)_3` sol? `NaCl`, `Na_2 SO_4`, `(NH_4)_3 PO_4`, `K_2 SO_4`

A

NaCl

B

`Na_(2)S`

C

`(NH_(4))_(3)PO_(4)`

D

`K_(2)SO_(4)`

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