1.

Which of the following electrolytes will have maximum coagulating value for AgI//Ag^(+) sol?a) Na_2Sb) Na_3PO_4c) Na_2SO_4d) NaCl

Answer»

`Na_2S`
`Na_3PO_4`
`Na_2SO_4`
`NaCl`

SOLUTION :`AgI // Ag^(+)`is a positively charged sol and can be easily coagulated by adding negatively charged IONS having high valency. COAGULATION value is just the reverse of it. Electrolyte whose negative ion (anion) has LEAST negative charge will require maximum amount and hence will have maximum coagulating value. Thus, `Cl^(-)` (from NaCl) will have maximum coagulating value.


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