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How is nitrogen prepared in the laborato...

How is nitrogen prepared in the laboratory? Write the chemical equations

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Laboratory preparation of nitrogen is as follows
: i) In laboratories, nitrogen is prepared by an aqueous solution of ammonium chloride and sodium nitrite.
`NH_(4)Cl (aq) + NaNO_(2) (aq) rarr N_(2)(g) + 2H_(2)O(l) + NaCl (aq)`
ii) `N_(2)` can also be prepared by thermal decomposition of ammonium dichromate.
`(NH_(4))_(2) Cr_(2)O_(7) overset(Heat)rarr N_(2) + 4H_(2)O + Cr_(2)O_3`
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