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An orange solid (A) on heating gave a gr...

An orange solid `(A)` on heating gave a green residue `(B)`, colourless gas `( C)` and water vapour. The dry gas `( C)` on passing over heated magnesium gave a white solid `(D).(D)` on reaction with water have a gas `( E)` which formed dense white fumes with `HCl`. Indentify `(A)` to `( E)` and give the reactions.

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A = `(NH_(4))_(2)Cr_(2)O_(7)` B = `Cr_(2)O_(3)`
c = `N_(2)` D = `Mg_(3)N_(2)`
E = NH_(3)
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