# NEET Chemistry Chemical Kinetics Questions Solved

NEET - 2006

For the reaction 2A + B  3C + D which of the following does not express the reaction rate ?

(a) $-\frac{\mathrm{d}\left[\mathrm{C}\right]}{3\mathrm{dt}}$

(b) $-\frac{\mathrm{d}\left[\mathrm{B}\right]}{\mathrm{dt}}$

(c) $\frac{\mathrm{d}\left[\mathrm{D}\right]}{\mathrm{dt}}$

(d) $-\frac{\mathrm{d}\left[\mathrm{A}\right]}{2\mathrm{dt}}$

For the reaction 2A + B → 3C + D

The reaction rate is written as follows
The reaction rate w.r.t. A = $-\frac{1}{2}\frac{\mathrm{d}\left[\mathrm{A}\right]}{\mathrm{dt}}$
The reaction rate w.r.t B = $-\frac{\mathrm{d}\left[\mathrm{B}\right]}{\mathrm{dt}}$
The reaction rate w.r.t. C = $+\frac{1}{3}\frac{\mathrm{d}\left[\mathrm{C}\right]}{\mathrm{dt}}$
The reaction rate w.r.t. D = $\frac{\mathrm{d}\left[\mathrm{D}\right]}{\mathrm{dt}}$
Hence, the answer (a) is not correct expression for represent the rate of reaction.

Difficulty Level:

• 84%
• 7%
• 7%
• 4%