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

Options

A. `Na_(2)SO_(4)`
B. `Na_(3)PO_(4)`
C. `Na_(2)SO_(4)`
D. `NaCl`

Answer

D

Explanation

`AgI|Ag^(+)` is positively charged sol. Electrolyte whose negative ion (anion) has least negative charge will require maximum amount and hence willhave maximum coagulationg vlaue. Hence, `Cl^(-)` (i.e., NaCl) will have maximum coagulating value (coagulating power will be maximum for `PO_(4)^(3-),i.e., Na_(3)PO_(4).`