Which of the following statement is incorrect ?

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In coagulation of a negative sol, flocculating power is in the order of Al3+ > Ba2+ >Na+

In the flocculation of a positive sol, flocculating power is in the order, Cl- >SO42- >PO4-3 > [Fe(CN)6]-4

Lyophilic colloids have greater affinity for solvents

Lyophilic sols are more stable than lyophobic sols

answer is B.

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Detailed Solution

According to Hardy – Schultz rule :-Coagulation power of oppositely charged ion ∝ Valency (charge) of ionThusGreater the valency of the ion greater will be its flocculating power to flocculate the oppositely charged sol.∴ for Positive sol coagulation :Power of Coagulation …….. Cl− < SO4−2 < PO4−3 < FeCN6−4for Negative sol coagulation :Power of Coagulation …….. Al+3 > Ba+2 > Na+Lyophilic sols are highly solvated and thus are highly stable and cannot be coagulated easily.

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