Assertion (A) : The addition of more electrolytes to sol suppresses the diffused double layer and reduces the zeta potential.
Reason (R) : The potential difference between the fixed layer and the diffused layer of opposite charges is called the zeta potential.

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A and R are true and R is the correct explanation of A.

A and R are true but R is not the correct explanation of A

A is true, R is false.

Both A and R are false.

answer is B.

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Detailed Solution

The addition of an electrolyte in a solution causes coagulation as a result of the preferential adsorption of the ions of charge opposite to that on the colloidal particle. This preferential adsorption lowers the zeta potential to some critical value, and coagulation takes place.
The potential difference between the fixed charge layer and diffused layer in the electrical double layer of opposite charge is called electrokinetic potential or zeta potential.

Hence, A and R are true but R is not the correct explanation of A.

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