Q.

A positively charged colloidal sol is formed in which of the following?

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a

100mL of 01 M AgNO3+100 mL or 0.1 MKI

b

100 mL of 0.1 M AgNO3 50 mL  or 0.1 M KI

c

50 mL of 0.1 M AgNO3+100 mL of 0.1 M KI

d

200 mL of 0.1 M AgNO3+100 mL of 0.2 M KI

answer is B.

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Detailed Solution

Agl is precipitated. If AgNO3, is in excess, Ag+ is adsorbed on Agl and positively charged colloidal sol is formed.AgNO3+KI⟶AgI+KNO3AgI+Ag+⟶[AgI]Ag+       excess
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