1.

As_2S_3is solublein yellowammonium sulphide due to the formation of :

Answer»

`(NH_4)_2S`
`(NH_4)_3As S_4`
`H_3AsO_4`
`As_2S_3` sol.

SOLUTION :`As_2S_3 + 3(NH_4)_2 S + 2S to underset("AMM. thioarsenate")(2(NH_4)_2 As S_4)`


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