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Gelatin protects

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${As}_{2} S_{3}$ sol

$Fe (OH)_{3}$

All the above

Gold sol

answer is D.

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Detailed Solution

Lyophobic solutions include those of gold, ${As}_{2} S_{3}$ sol, $Fe (OH)_{3}$

A lyophilic colloid with a low gold number value and a very high protective power is gelatin.

As a result, it can shield all lyophobic colloids.

Therefore we can say that gelatin protects all the three options that is Gold sol, ${As}_{2} S_{3}$ sol, $Fe (OH)_{3}$ .

Hence the correct option is (D).

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