The function of gum arabic in the preparation of Indian ink is :

coagulation

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peptisation

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protective action

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adsorption

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Solution

The correct option is D protective action
Gum Arabic (Acacia gum) provides some viscosity in the liquid ink and oddly enough also reduces the surface tension. It acts as binder to paper when the ink dries. You might call that coagulation. Gum Arabic is also uses as a protectant in some printing processes.

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Similar questions

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?

0.005 - 0.01

0.15 - 0.25

0.04 - 1.0

15 - 25

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