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When negatively charged colloids like ${As}_{2} S_{3}$ sol are added to positively charged $Fe {(OH)}_{3}$ sol in suitable amounts:

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both sols are precipitated simultaneously.

the process is called mutual coagulation.

they become positively charged colloids.

They become negatively charged colloids.

answer is A, B.

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Detailed Solution

Due to the opposite charges of the two colloids, when we combine them, they coagulate due to the opposite charge colloidal sol and create precipitate at the same time.
It is known as mutual coagulation.

Hence the correct option is a and b.

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