Gold numbers of some colloids are :
Gelatin : $0.005 - 0.01$ , Gum Arabic : $0.15 - 0.25$ ; Oleate : $0.04 - 1.0$ ; Starch : $15 - 25$ .

Which among these is a better protective colloid?

Gelatin

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Starch

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Oleate

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Gum Arabic

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Solution

The correct option is A Gelatin
Gold number $\propto \frac{1}{P r o t e c t i v e p o w e r}$

Therefore, a gold number of Gelatin is the lowest among the above and hence is a better protective colloid.

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Similar questions

\begin{matrix} I . C a s e i n & 0.01 I I . H a e m o g l o b i n & 0.03 I I I . G u m A r a b i c & 0.15 I V . S o d i u m o l e a t e & 0.40 \end{matrix}

Gold number of some lyophilic sols are

$\begin{matrix} (i) & Casein & 0.01 (i i) & Haemoglobin & 0.03 (i i i) & Gum Arabic & 0.15 (i v) & Sodium oleate & 0.40 \end{matrix}$

Which has maximum protective power?

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