Question

The order of coagulating power of following ions in the coagulation of a positive sol is:

i. \[\ce{PO^{3-}_4}\]

ii. \[\ce{SO^{2-}_4}\]

iii. \[\ce{[Fe(CN)6]^{4-}}\]

iv. \[\ce{NO^-_3}\]

Options

• i < ii < iii < iv

• iv < ii < iii < i

• iv < ii < i < iii

• iv < i < ii < iii

Answer 1

iv < ii < i < iii

Explanation:

The higher the charge (greater the valency) of the coagulating ion, the larger its coagulating power, according to the Hardy-Schulze rule.