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On heating copper turnings with conc. `HNO_(3)`, a brown coloured gas is evolved which upon cooling dimerises. Identify the gas.

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The gas is `NO_(2)`. It dimerises to form `N_(2)O_(4)`.
`Cu+4HNO_(3) ("conc".) to Cu(NO_(3))_(2)+2NO_(2)+2H_(2)O`.
`2NO_(2) overset("cooling") harr underset(("Dimer"))(N_(2)C_(4)`

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