A white powder solid A forms a light green solution with water, which on treatment with potassium hexacyanoferrate(iii) gives a blue precipitate. On being strongly heated, A leaves a brown residue and forms a mixture of two gaseous oxides,

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A white powder solid A forms a light green solution with water, which on treatment with potassium hexacyanoferrate(iii) gives a blue precipitate. On being strongly heated, A leaves a brown residue and forms a mixture of two gaseous oxides, which turns a dichromate solution green and forms a white precipitate with a BaCl ₂ solution containing concentrated HCl ₄ ^ A ' is:

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Correct answer: C. FeSO ₄

aligned & ( A ) 2 FeSO ₄ Fe ₂ O ₃+ SO ₂+ SO ₃ & Fe ⁺²+ [ Fe ( CN )₆ ]³⁻ Blue ppt aligned

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