What does the $Gold \ Number$ measure?
- AIt indicates the amount of gold present in a colloidal solution.
- BIt indicates the amount of gold required to break a colloid.
- CIt is the minimum amount of protective colloid in milligrams required to prevent the coagulation of $10 \ mL$ of a gold sol when $1 \ mL$ of $10\% \ NaCl$ solution is added.
- DNone of the above.
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Identify the negatively charged sol from the following.
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