When negatively charged colloid like \( \mathrm{As}_{2} \mathrm{~S}_{3} \) sol is added to posit...

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When negatively charged colloid like \( \mathrm{As}_{2} \mathrm{~S}_{3} \) sol is added to positively charged \( \mathrm{Fe}(\mathrm{OH})_{3} \) sol in stoichiometric amounts
(a) both the are precipitated simultaneously
(b) this process is called mutual coagulation
(c) they becomes positively charged colloid
(d) they become negatively charged colloid
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