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Surface Chemistry

Question
CBSEENCH12011160
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The protecting power of lyophilic colloidal sol is expressed in terms of 

  • Coagulation value

  • Gold number

  • Critical micelle concentration

  • Oxidation number

Solution

B.

Gold number

Lyophobic sols are unstable, so they re-stabilised by adding some lyophilic colloids which protect them from precipitation. Thus, lyophilic colloids are called protecting colloids. Their protecting power is expressed in terms of gold number.
[Lesser the gold number, higher si the protecting power,]

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