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

Options

A. `NO_(3)^(-)gtSO_(4)^(2-)gtPO_(4)^(3-)`
B. `SO_(4)^(2-)gtNO_(3)^(-)gtPO_(4)^(3-)`
C. `PO_(4)^(3-)gtSO_(4)^(2-)gtNO_(3)^(-)`
D. `NO_(3)^(-)=SO_(4)^(2-)=PO_(4)^(3-)`

Answer

C