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How a colloidal sol of arsenous sulphide...

How a colloidal sol of arsenous sulphide is prepared ?

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Colloidal sol of arsenous sulphide is prepared by the double decompostion of `As_(2)O_(3)` and `H_(2)S` as follows.
`As_(2)O_(3) + 3H_(2)S overset("Double decomposition")to As_(2)S_(3_("(sol)")) + 3H_(2)O`
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