Which one of the following will act as best protective colloid?

Gelatin (Gold No.0.005)

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Starch (Gold No.25)

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Gum arabic (Gold No.0.15)

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Egg albumin (Gold No.0.08)

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Solution

The correct option is B Gelatin (Gold No.0.005)
Protective power of colloid is inversely proportional to gold number.
Thus, smaller is the gold number, higher is the protective action of the protective agent.
$P r o t e c t i v e P o w e r = 1 / G o l d N u m b e r$
Thus Gelatin with lowest gold number, act as best protective colloid,
therefore option A is correct answer.

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What is gold no. ? Explain with example

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Which has maximum protective power?

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