NEET 2012 Chemistry question

Not in JEE Main or NEET syllabus

The protecting power of lyophilic colloidal sol is expressed in terms of

(1)Oxidation number
(2)Coagulation value
(3)Gold numberCorrect
(4)Critical miscelle concentration

Answer: (3)

Solution

The protective power of a lyophilic colloid is measured by its gold number: the minimum mass (in mg) of the lyophilic colloid which, when added to 10 mL of a standard red gold sol, just prevents its coagulation (colour change from red to blue) on adding 1 mL of 10% NaCl solution. A smaller

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Question ID VK-091110