How many of the following are negatively charged sols? Eosin dye, sol of charcoal, haemoglobin, A...

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How many of the following are negatively charged sols?
Eosin dye, sol of charcoal, haemoglobin, Al_2O_3·xH_2O, As_2 S_3, TiO_2· sol, copper sol
(a) 3
(b) 4
(c) 6
(d) All of these

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