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  4. Gold number is the index for:

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Q. Gold number is the index for:

Delhi UMET/DPMTDelhi UMET/DPMT 2001

Solution:

Lyophilic colloids are called protective colloid because they protect lyophobic colloids from precipitation.
The protective power of lyophilic colloids is compared by Gold number.
Smaller the gold number of protective colloid greater is its protective action.