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

Options

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

Answer

D

Explanation

Coagulation value `prop (1)/("Charge on the ion")`
`AgI//Ag^(+)` is positive colloid
`therefore` Negative ions with minimum negative charge has maximum coagulating value.
`therefore` NaCl has maximum coagulation value.