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AIIMS 201926 May
Exam
AIIMS
Year
2019
Date
26 May
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

AIIMS 2019 · 26 May · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Assertion : Pure N_2 is obtained from Ba(N_3)_2 but not from...

Assertion : Pure N2\mathrm{N}_2 is obtained from Ba(N3)2\mathrm{Ba}\left(\mathrm{N}_3\right)_2 but not from \left(\mathrm{NH}_4\right)_2 \mathrm{Cr}_2 \mathrm{O}_7.Reason:Ondecomposition,. Reason : On decomposition,\left(\mathrm{NH}_4\right)_2 \mathrm{Cr}_2 \mathrm{O}_7givesgives\mathrm{O}_2 gas.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false.

Step-by-step solution

(NH4)2Cr2O7⟶ΔN2+Cr2O3+4H2OBa(N3)2⟶ΔBa+3 N2 (pure) \left(\mathrm{NH}_4\right)_2 \mathrm{Cr}_2 \mathrm{O}_7 \stackrel{\Delta}{\longrightarrow} \mathrm{N}_2+\mathrm{Cr}_2 \mathrm{O}_3+4 \mathrm{H}_2 \mathrm{O} \mathrm{Ba}\left(\mathrm{N}_3\right)_2 \stackrel{\Delta}{\longrightarrow} \mathrm{Ba}+\underset{\text{ (pure) }}{3 \mathrm{~N}_2}
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