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Q.

Gold number is minimum in case of

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a

Egg albumin

b

Gelatin

c

Heamoglobin

d

Starch

answer is B.

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Detailed Solution

Gold number is minimum in case of gelatin.
Gelatin has the most protective power as gold number is inversely proportional to the protective power.
Gold number is defined as the amount of protective colloid which is just sufficient to prevent coagulation of10ml of a standard hydro gold sol when $1 ml$ of $10 % NaCl$ solution is added to it. Some compounds have a particular range of gold numbers.
More is the gold number, less is the protective power of the lyophilic solid. The amount is taken in weight in milligrams. Hence, the correct answer is option B) Gelatin.

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