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Among the following,the $INCORRECT$ statement about colloids is

On adding a few drops of dilute $HCl$ or $FeCl_3$ to freshly precipitated ferric hydroxide,a red-coloured colloidal solution is obtained. This phenomenon is known as:

$A$ colloidal system consisting of a gas dispersed in a solid is called a/an:

In which of the following does coagulation not occur?

The surface tension of a lyophilic sol is ......

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