Ferric hydroxide sol is positively charg...

Ferric hydroxide sol is positively charged colloid. The coagulating power of `NO_(3)^(-), SO_(4)^(2-) and PO_(4)^(3-)` ions is in the order __________.

A

`NO_3^(-)gt SO_4^(2-) gt PO_4^(3-)`

B

`SO_4^(2-) gt NO_3^(-) gt PO_4^(3-)`

C

`PO_4^(3-) gt SO_4^(2-) gt NO_3^(-)`

D

`NO_3^(-1) = SO_4^(2-)=PO_4^(3-)`

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