1.

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

Answer»

`NaNO_(3) gtAl(NO_(3))_(3) GT Ba(NO_(3))_(2)`
`Al(NO_(3))_(3) gt Ba(NO_(3))_(2) gt NaNO_(3)`
`Al(NO_(3))_(2) gt NaNO_(3) gt Ba(NO_(3))_(2)`
`NaNO_(3) gt Ba(NO_(3))_(2) gt Al(NO_(3))_(3)`

SOLUTION :According to Hardy Schulze law , for coagulationQuantityof electrolyte ` prop (1)/("Charge on thecation/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)^(-)`
Chargeon thecationdecrease in the order .
`Al^(3+) gt Ba^(2+) gt Na^(+)`
Thus , the AMOUNTOF electrolytes REQUIRED will bethe order `NaNO_(3) gt Ba(NO_(3))_(2) gt Al(NO_(3))_(3)`


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