The coagulation of $10\;{\rm{c}}{{\rm{m}}^3}$ of gold sol is completely prevented by addition of $0.025\;{\rm{g}}$ of starch to it. The gold number of starch is

JEE CHEMISTRY MCQ: SURFACE CHEMISTRY

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The coagulation of

10\;\mathrm{c}{\mathrm{m}^3}

of gold sol is completely prevented by addition of

0.025\;\mathrm{g}

of starch to it. The gold number of starch is

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Correct option: D

Option D (25) is correct because the gold number is defined as the amount of protective colloid in milligrams required to prevent coagulation of 10 cm³ of gold sol.

JEE CHEMISTRY MCQ: SURFACE CHEMISTRY

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