NEET PYQs for Rate of A Chemical Reaction with Solutions: Practice NEET Previous Year Questions

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Updated on - Jan 19, 2026

Rate of A Chemical Reaction is an important topic in the Chemistry section in NEET exam. Practising this topic will increase your score overall and make your conceptual grip on NEET exam stronger.

This article gives you a full set of NEET PYQs for Rate of A Chemical Reaction with explanations for effective preparation. Practice of NEET Chemistry PYQs including Rate of A Chemical Reaction questions regularly will improve accuracy, speed, and confidence in the NEET 2026 exam.

NEET PYQs for Rate of A Chemical Reaction with Solutions

1.
For the reaction $ {H2_{(g)} + I2_{(g)} <=> 2HI_{(g)} }$, the rate of reaction is expressed as
- $\frac{\Delta\left[H_{2}\right]}{\Delta \,t}=\frac{1}{2} \frac{\Delta\left[I_{2}\right]}{\Delta\,t}=-\frac{\Delta\left[HI\right]}{\Delta\,t}$
- $-\frac{\Delta\left[I_{2}\right]}{\Delta t}=-\frac{\Delta\left[H_{2}\right]}{\Delta t}=\frac{1}{2} \frac{\Delta\left[HI\right]}{\Delta t}$
- $-\frac{\Delta\left[I_{2}\right]}{\Delta t}=-\frac{\Delta\left[H_{2}\right]}{\Delta t}= \frac{\Delta\left[HI\right]}{2\Delta t}$
- none of these
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2.
The unit of rate constant for zero order reaction is
- ${{s}^{-1}} $
- $ mol\,{{L}^{-1}}{{s}^{-1}}$
- $ L\,mo{{l}^{-1}}{{s}^{-1}}$
- ${{L}^{2}}\,mo{{l}^{-2}}{{s}^{-1}} $
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3.
Mechanism of a hypothetical reaction $X _{2}+ Y _{2} \rightarrow 2 XY$ is given below: (i) $X_{2} \rightarrow X+X$ (fast) (ii) $X + Y _{2} \rightleftharpoons XY + Y$ ( slow ) (iii) $X + Y \rightarrow XY$ (fast) The overall order of the reaction will be
- 2
- 0
- 1.5
- 1
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