How is nitrogen prepared from ammonia?

1.	How is nitrogen prepared from ammonia?
Answer» Solution :`NH_(3)` is first treated with dil. HCl and the ammonium chlorids thus formed is treated with an aqueous solution of sodium NITRITE when `N_(2)` gas is evolved. `NH_(3)(g)+HCl(aq)toNH_(4)Cl(aq)` `NH_(4)Cl(g)+NaNO_(2)(aq)toNH_(4)NO_(2)(aq)+NaCl(aq)` `NH_(4)NO_(2)(aq)OVERSET(Delta)toN_(2)(g)+2H_(2)O(l)`

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