1.

Give preparation of dinitrogen (N_(2)).

Answer»

Solution :(i) Commercial preparation : Commercially DINITROGEN is produced by liquefaction and fractional distillation of air. Liquid dinitrogen (b.p. 77.2K) distills out FIRST leaving behind liquid oxygen (b.p. 90K).
(ii) Laboratory preparation : In the laboratory, dinitrogen is prepared by TREATING an aqueous solution of ammonium chloride with SODIUM nitrite.
`NH_4Cl(aq) + NaNO_(2)(aq) to NaCl(aq) + N_2(g) + 2H_(2)O`(/) By thermal decomposition : Thermal decomposition of ammonium dichromate and metal azide such as `Ba(N_3)_2` or `NaN_3` yeilds nitrogen.
`(NH_(4))_(2)Cr_(2)O_(7) overset(Delta) to N_(2) + 4H_(2)O + Cr_(2)O_(3)`
`Ba(N_(3))_(2) overset(Delta)to Ba + 3N_(2)(g)`
`2NaN_(3) overset(Delta) to 2Na + 3NH_(2)(g)`
From metal azide very pure dinitrogen is obtained.


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