Q55 / 180 · KCET 2018 · Chemistry

Very pure \( \mathrm{N}_{2} \) can be obtained by

  • A
    Thermal decomposition of ammonium dichromate
  • B
    Treating aqueous solution of \( \mathrm{NH}_{4} \mathrm{Cl} \) and \( \mathrm{NaNO}_{2} \)
  • C
    Liquifaction and fractional distillation of liquid air
  • Correct answer
    D
    Thermal decomposition of sodium azide

Solution

By heating sodium azide, pure nitrogen can be obtained
\( 2 N a N_{3}-->2 N a+3 N_{2} \)
Sodium a zide

Hence, the correct answer is option: 'D'.

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