Select the wrong statement. If a very small amount of AlCl _3 is added to gold sol,

JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Select the wrong statement. If a very small amount of is added to gold sol,

(A)Coagulation occurs, but if a large quantity of is added, there is no coagulation
(B)Organic ions are more strongly adsorbed on charged surfaces in comparison to inorganic ions
(C)Both emulsifier and peptising agents stabilise colloids but their actions are different
(D)Colloidal solutions are thermodynamically stableCorrect

Answer: (D)

Solution

A small amount of coagulates the negatively charged gold sol by the usual electrolyte-coagulation mechanism, but a large excess of a highly charged ion like can over-adsorb on the particles, reverse their surface charge, and re-stabilise the sol, so (A) is a valid (if subtle)

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Question ID VK-144760