NEET Chemistry Surface Chemistry Questions Solved


Assertion : The addition of ferric hydroxide sol to arsenic sulphide sol results in the precipitation

                   of both.

Reson : The colloidal particles in ferric hydroxide carry positive charge, whereas those in arsenic

             sulphide sol carry negative charge.

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(A). The addition of ferric hydroxide sol to arsenic sulphide sol results in the precipitation of both

       because the colloidal particles in ferric hydroxide carry positive charge, whereas those in

       arsenic sulphide sol carry negative charge. So, when these sols are mixed, the charges on

       each other get neutralized and as a result, both the sols get coagulated. 

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