A white amorphous powder a on heating yields a colourless, non-combustible gas B 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 E ob addition of NaOH solution, which dissolves on further addtion of base. Identify the compound A, B, C, D and E.

A white amorphous powder a on heating yields a colourless, non-combust

1.	A white amorphous powder a on heating yields a colourless, non-combustible gas B 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 E ob addition of NaOH solution, which dissolves on further addtion of base. Identify the compound A, B, C, D and E.
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