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The $Gold \ Number$ indicates:

Which of the following contributes to the extra stability of lyophilic colloids?

The zig-zag motion (erratic motion) of particles in a colloid was observed by:

The critical micelle concentration $(CMC)$ of a soap solution is $5 \times 10^{-4} \ mol \ L^{-1}$. Identify the correct statements about this solution.
$I$. The micelle is stable if the soap solution concentration is $10^{-7} \ mol \ L^{-1}$
$II$. The micelle is stable if the soap solution concentration is higher than $5 \times 10^{-4} \ mol \ L^{-1}$
$III$. Micelles are also known as associated colloids.

What is the range of particle size in the colloidal state?

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