Distinguish by a chemical test,
Sodium chloride and sodium sulphite
Sodium thiosulphate and sodium sulphite:
The salts can be distinguished by using silver acetate. To the salt silver acetate and dil. HNO3 are added. If there is formation of a white precipitate which slowly turns black then it is thiosulphate anion since silver acetate forms Ag2S2O3 which being unstable in acid solution gets converted to black Ag2S.
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