NEET 2019 Chemistry question

Not in JEE Main or NEET syllabus

Which mixture of the solutions will lead to the formation of negatively charged colloidal sol ?

(1)50 mL of 1 M + 50 mL of 1.5 M KI
(2)50 mL of 1 M + 50 mL of 2 M KICorrect
(3)50 mL of 2 M + 50 mL of 1.5 M KI
(4)50 mL of 0.1 M + 50 mL of 0.1 M KI

Answer: (2)

Solution

. A colloidal AgI sol preferentially adsorbs the common ion present in excess in the dispersion medium: excess gives the negatively charged sol , whereas excess gives the positively charged sol

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Question ID VK-092446