The number of moles of lead nitrate needed to coagulate 2 mole of colloidal `[AgI]I^(-)` is :

Options

A. 2
B. 1
C. `(1)/(2)`
D. `(2)/(3)`

Answer

B

Explanation

`[2AgI]I^(-)+Pb^(2+)toPbl_(2)+2Agl`
Thus one mole of Pb(NO_3)` IS required to coagulate 2 mole of `[AgI]I^(-).]`