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On heating, (NH(3))(2)Cr(2)O(7) gives ri...

On heating, `(NH_(3))_(2)Cr_(2)O_(7)` gives rise to a gas which on treatment with Mg ribbon gives a white solid. On dissolving white solid in water another gas (X) is evolved. It gives white fumes when a rod dipped in conc. HCl is brought in its contact. Identify the gas X.

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