Chemistry - Salt Analysis Question with Solution | TestHub

A salt mixture contain a black halide salt (A) and a white salt (B). Salt mixture dissolves in dilute sulphuric acid solution producing a clear blue solution and produce gas (F). Passing ${\mathrm{H}}_2\mathrm{S}$ gas through this solution gave black precipitate (C). The solution was filtered off and boiled then colourless filtrate was treated with aqueous ammonia giving a white precipitate (D), that was readily soluble in excess ${\mathrm{NH}}_4\mathrm{OH}$ solution.

Sodium extract of the salt mixture was prepared and divided into two parts. One part of the extract was treated with BaCl₂ solution, giving a white precipitate (E), which dissolved into dilute HCl evolving a gas (F). (F) turned a filter paper, moistened with acidified K₂Cr₂ O₇ solution, green. Other part of extract was mixed with excess of MnO₂ and concentrated sulphuric acid solutions and finally boiled. A brown coloured vapour was formed which gave orange-red staining when passed through strach paper.

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