Which of the following statements is not correct?

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Muddy water can be coagulated more effectively by alum as compared to NaCl.

Surface tension of lyophilic colloids is less than that of the dispersion medium.

When excess ${AgNO}_{3}$ solution is added to Kl sol and the resultant colloidal state is subjected to electrophoresis, coagulation will be observed near anode.

Ferrimagnetic substance on heating show paramagnetic behaviour.

answer is C.

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Detailed Solution

A positive charged sol of silver iodide is created when a diluted solution of potassium iodide is introduced to a small excess of a diluted solution of silver nitrate. It results from ${Ag}^{+}$ ions from the dispersion media adhering to the silver iodide precipitate (AgI).
However, a negatively charged sol of silver iodide is created when a tiny excess of a diluted potassium iodide solution is combined with a diluted silver nitrate solution. It results from iodide ions from the dispersion media adhering to the silver iodide precipitate. Colloidal particles are drawn to the anode as a result.

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