NEET-XII-Chemistry
Previous Year Paper year:2017
- #72Which mixture of the solutions will lead to the
formation of negatively charged colloidal
``[AgI]I^- `` sol ?
(1) 50 mL of 1 M ``AgNO_3`` + 50 mL of 1.5 M KI
(2) 50 mL of 1 M ``AgNO_3`` + 50 mL of 2 M KI
(3) 50 mL of 2 M ``AgNO_3`` + 50 mL of 1.5 M KI
(4) 50 mL of 0.1 M ``AgNO_3`` + 50 mL of 0.1 M KIdigAnsr: 2Ans : ( 2 )
Sol. Generally charge present on the colloid is due
to adsorption of common ion from dispersion
medium. Millimole of KI is maximum in
option (2) (50 × 2 = 100) so act as solvent and
anion I- is adsorbed by the colloid AgI formed