\( \mathrm{As}_{2} \mathrm{~S}_{3} \) sol is: (a) positive colloid (b) negative colloid (c) neut...

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\( \mathrm{As}_{2} \mathrm{~S}_{3} \) sol is:
(a) positive colloid
(b) negative colloid
(c) neutral colloid
(d) none of the above
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