1.

Na_(2)S_(2)O_(3) is formed when

Answer»

`Na_2S` is boiled with SULPHUR
`Na_2SO_3` is boiled with `Na_(2)S`
`Na_2SO_3` is boiled with sulphur
`Na_2CO_3` is boiled with conc. `H_2SO_4`

ANSWER :C


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