JEE CHEMISTRY MCQ: SURFACE CHEMISTRY

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On addition of 1mL solution of 10% NaCl to 10mL gold solution in the presence of

0.025\;g

of starch, the coagulation is prevented because starch has the following gold numbers

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Correct option: A

Option A (25) is correct because the gold number is defined as the amount of protective colloid in milligrams that prevents coagulation of 10 mL of gold solution by 1 mL of 10% NaCl solution.

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