Which of the following electrolytes will have maximum coagulating value for `AgI//Ag^(+)` sol ?

Options

A. `Na_2S`
B. `Na_3PO_4`
C. `Na_2SO_4`
D. NaCl

Answer

D

Explanation

The coagulation value decreases with increase in charge of the Coagulation ion.
Coagulating power
`prop1/("coagulation value")prop` charge
As `AI//Ag^+` is a positive sol so negative ion will coause the coagulation .
Ions of the given electrolytes are, `S^(-2),PO_4^(3-),SO_4^(2-) and Cl^(-)`
As `Cl^(-)` has minimum charge thus has maximum coagulating value.