JEE Main · 2022 · Shift-ImediumPB12-047

Nitrogen gas is obtained by thermal decomposition of:

p-Block Elements (Class 12) · Class 12 · JEE Main Previous Year Question

Question

Nitrogen gas is obtained by thermal decomposition of:

Options
  1. a

    NaNO2\mathrm{NaNO_2}

  2. b

    NaNO3\mathrm{NaNO_3}

  3. c

    Ba(N3)2\mathrm{Ba(N_3)_2}

  4. d

    Ba(NO3)2\mathrm{Ba(NO_3)_2}

Correct Answerc

Ba(N3)2\mathrm{Ba(N_3)_2}

Detailed Solution

Strategy: Identify laboratory methods for producing high-purity dinitrogen gas.

Step 1: Reaction Analysis Very pure dinitrogen can be obtained by the thermal decomposition of Sodium azide (\ceNaN3)(\ce{NaN3}) or Barium azide (\ceBa(N3)2)(\ce{Ba(N3)_2}). \ceBa(N3)2ΔBa+3N2\ce{Ba(N3)_2 \xrightarrow{\Delta} Ba + 3N_2} In contrast, reactions like \ceNH4Cl+NaNO2N2+2H2O+NaCl\ce{NH4Cl + NaNO2 \to N2 + 2H2O + NaCl} produce \ceN2\ce{N2} with impurities like \ceNO\ce{NO} and \ceHNO3\ce{HNO3}.

Step 2: Conclusion The heating of Barium azide is the preferred method for high-purity nitrogen.

Answer: (Option) [c] \ceBa(N3)2\boxed{\text{Answer: (Option) [c] $\ce{Ba(N3)_2}$}}

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