Question

why a negatively charged sol is obtained on adding AgNO3 solution to KI solution? ​

Answer 1

Answer:

In order to form a negatively charged colloidal sol on adding AgNO

3

solution into KI solution, KI should be in excess.

Among all options, KI is in excess in option B as shown:

50 mL of 0.1 M AgNO

3

+ 40 mL of 0.1 M KCl

m moles of AgNO

3

=50×0.1=5

m moles of KI=50×0.2=10

KI is in excess

So, I

−

is adsorbed on AgI sol

Answer 2

Answer:

In order to form a negatively charged colloidal sol on adding AgNO

3

solution into KI solution, KI should be in excess.

Among all options, KI is in excess in option B as shown:

50 mL of 0.1 M AgNO

3

+ 40 mL of 0.1 M KCl

m moles of AgNO

3

=50×0.1=5

m moles of KI=50×0.2=10

KI is in excess

So, I

−

is adsorbed on AgI sol