Solved: CHEMISTRY Question for NEET

NEET CHEMISTRYMedium

Which mixture of the solutions will lead to the formation of negatively charged colloidal $[AgI]I^-$ sol ?

50 mL of 1 M $AgNO_3$ + 50 mL of 1.5 M $KI$

50 mL of 1 M $AgNO_3$ + 50 mL of 2 M $KI$

50 mL of 2 M $AgNO_3$ + 50 mL of 1.5 M $KI$

50 mL of 0.1 M $AgNO_3$ + 50 mL of 0.1 M $KI$

Step-by-Step Solution

Generally charge present on the colloid is due to adsorption of common ion from dispersion medium. Millimole of $KI$ is maximum in option (2) ( $50 \times 2 = 100$ ) so act as solvent and anion $I^-$ is adsorbed by the colloid $AgI$ formed. $AgNO_3 + KI \rightarrow AgI + KNO_3$ .

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