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Friday, 9 October

NEET UG 2019 · Chemistry · Question 67

NEET 2019 Chemistry, question 67

Question 67 of the NEET 2019 paper (code P1) is a Chemistry question from Chemical Kinetics. Its idea, Rate of Appearance and Disappearance, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 3.

Updated 2026-10-08

Q67 · Chemistry

For the chemical reaction

N2(g)+3H2(g)⇌2NH3(g)N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)

the correct option is :

  1. 1−13d[H2]dt=−12d[NH3]dt-\frac{1}{3}\frac{d[H_2]}{dt} = -\frac{1}{2}\frac{d[NH_3]}{dt}
  2. 2−d[N2]dt=2d[NH3]dt-\frac{d[N_2]}{dt} = 2\frac{d[NH_3]}{dt}
  3. 3−d[N2]dt=12d[NH3]dt-\frac{d[N_2]}{dt} = \frac{1}{2}\frac{d[NH_3]}{dt}Official answer
  4. 43d[H2]dt=2d[NH3]dt3\frac{d[H_2]}{dt} = 2\frac{d[NH_3]}{dt}

Official answer: option 3 · NTA final answer key

Same idea

The only question on Rate of Appearance and Disappearance

No other NEET paper from 2017–2026 tested this exact idea.

Rate of Appearance and Disappearance: every question and how it was framed

The chapter

Chemical Kinetics in ten years of NEET

21 questions from 2017–2026, asked in 10 of 10 papers, about 2.0 a paper. Chemical Kinetics alone had 21.

Chapter analysisStudy this chapterPractise this chapter

Chemical Kinetics: questions per paper

0242’172’182’192’202’212’222’233’242’252’26