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The negative charge on `As_2S_3` sol is due to adsorption of
A. |
`H^-` |
B. |
`OH^-` |
C. |
`O^(2-)` |
D. |
`S^(2-)` |
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`As_2S_3` sol particles absorb common ion `(S^(2-))` on them to acquire negative charge .