Flocculation value of BaCl_2 is much less than that of KCl for sol A and flocculation value of Na_2SO_4 is much less than that of NaBr for sol B. The correct statement among the following is :

JEE Main 2013 Chemistry question

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Flocculation value of is much less than that of KCl for sol A and flocculation value of is much less than that of NaBr for sol B. The correct statement among the following is :

(1)Both the sols A and B are negatively charged.
(2)Sol A is positively charged and Sol B is negatively charged.
(3)Both the sols A and B are positively charged.
(4)Sol A is negatively charged and sol B is positively charged.Correct

Answer: (4)

Solution

A low flocculation value means a powerful coagulating ion, and the effective ion carries charge opposite to the sol's. For sol A, beats KCl because (divalent cation) is

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Question ID VK-104032