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Pb(NO(3))(2) on heating gives a brown ga...

`Pb(NO_(3))_(2)` on heating gives a brown gas which undergoes dimerization on cooling? Identify the gas.

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`Pb(NO_(3))_(2)` on heating produces nitrogen dioxide `(NO_(2))`. It is a brown gas. Being an odd electron species on cooling it undergoes dimerization to form dinitrogen tetroxide `(N_(2)O_(4))` which is colourless.
`underset("Lead nitrate")(2Pb(NO_(3))_(2))overset(Delta)to2PbO+underset(("Brown gas"))underset("Nitrogen dioxide")(4NO_(4))+O_(2),underset(("Brown"))(2NO_(2))overset("Cooling")tounderset(("Colourless"))(N_(2)O_(4))`
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