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All colloidal dispersions have

In which of the following,the sol is not correctly matched with respect to its charge?
$I$. $Al_2O_3 \cdot xH_2O$ sol; $+ve$ sol
$II$. Starch sol; $+ve$ sol
$III$. $TiO_2$ sol; $-ve$ sol
$IV$. Methylene blue sol; $+ve$ sol
The correct answer is

The gold numbers of gelatin,haemoglobin,and sodium acetate are $0.005$,$0.05$,and $0.7$ respectively. Their protective power will be in the order:

Which one of the sols acts as a protective colloid?

How many types of emulsions are there? Which are they?

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