When 1 g of compound ( X ) is subjected to Kjeldahl's method for estimation of nitrogen, 15 mL , 1 M H 2 SO 4 was neutralized by ammonia evolved. The percentage of nitrogen in compound ( X ) is :

Chemistry · Practical Organic Chemistry

JEE Main 2026 — 22 January, Evening Shift — Question 50

When 1 g of compound ( X ) is subjected to Kjeldahl's method for estimation of nitrogen, 15 $\mathrm{mL}, 1 \mathrm{M} \mathrm{H}_{2} \mathrm{SO}_{4}$ was neutralized by ammonia evolved. The percentage of nitrogen in compound $(\mathrm{X})$ is :

Option A:
21
Option B:
0.42
Option C:
42
Correct
Option D:
0.21

Answer: C

Step-by-step solution

eq. of $\mathrm{H}_{2} \mathrm{SO}_{4}=$ eq. of Ammonia $\Rightarrow \frac{15 \times 1 \times 2}{1000}=$ moles of ammonia $\times 1$ ⇒ Moles of ammonia $=$ moles of ' N ' ⇒ Weight of nitrogen $=\frac{15 \times 1 \times 2}{1000} \times 14=0.42$ $\%$ weight of ' $\mathrm{N}^{\prime}=\frac{0.42}{1} \times 100=42 \%$

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Exam: JEE Main 2026
Paper: 22 January, Evening Shift
Subject: Chemistry
Chapter: Practical Organic Chemistry
Topic: Quantitative organic analysis

Answer: C

Step-by-step solution

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