The amount of electrolytes required to coagulate a give amount of Agl colloidal solution (-ve charge) will be in the order .

Options

A. `NaNO_(3) gt Al(NO_(3))_(3) gt Ba(NO_(3))_(2)`
B. `Al(NO_(3))_(3) gt Ba(NO_(3))_(2) gt NaNO_(3)`
C. `Al(NO_(3))_(2) gt NaNO_(3) gt Ba(NO_(3))_(2)`
D. `NaNO_(3) gt Ba(NO_(3))_(2) gt Al(NO_(3))_(3)`

Answer

D

Explanation

According to Hardy Schulze law , for coagulation Quantity of electrolyte ` prop (1)/("Charge on the cation/anion")`
To coagulate `AgI,I^(-) (-ve "charge")` is to be coagulated .
`Al(NO_(3))_(3) to 2Al^(3+) + 2NO_(3)^(-)`
`Ba(NO_(3))_(2) to Ba^(2+) + 2NO_(3)^(-)`
`NaCO_(4) to Na^(+) + NO_(3)^(-)`
Charge on the cation decrease in the order .
`Al^(3+) gt Ba^(2+) gt Na^(+)`
Thus , the amount of electrolytes required will be the order `NaNO_(3) gt Ba(NO_(3))_(2) gt Al(NO_(3))_(3)`