A white amorphous powder A on heating yields a colourless, non-combustible gas B and a solid C. The later compound a

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Q 2617856780.     A white amorphous powder A on heating yields a colourless, non-combustible gas B and a solid C. The later compound assumes a yellow colour on heating and changes to white on cooling. C dissolves in dilute hydrochloric acid and the resulting
solution gives a white precipitate with K_4 Fe(CN)_6, solution. A dissolves in dil . HCl with the evolution of gas, which is identical in all respect with B.
The gas B turns lime water milky. but the milkiness disappears with the continuous passage of gas. The solution of A as obtained above, gives a white ppt Eon addition of NaOH solution, which dissolves on further addition of base. Identify the compounds A , B, C, D and E.
JEE 1979

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