Easy MCQ +4 / -1 PYQ · JEE Mains 2021

For a reaction of order n, the unit of the rate constant is :

  1. A mol<sup>1$-$n</sup> L<sup>1$-$n</sup> s
  2. B mol<sup>1$-$n</sup> L<sup>2n</sup> s<sup>$-$1</sup>
  3. C mol<sup>1$-$n</sup> L<sup>n$-$1</sup> s<sup>$-$1</sup> Correct answer
  4. D mol<sup>1$-$n</sup> L<sup>1$-$n</sup> s<sup>$-$1</sup>

Solution

Rate = k[A]<sup>n</sup><br><br>comparing units<br><br>${{(mol/l)} \over {\sec }} = k{\left( {{{mol} \over l}} \right)^n}$<br><br>$\Rightarrow k = mo{l^{(l - n)}}{l^{(n - 1)}}{s^{ - 1}}$

About this question

Subject: Chemistry · Chapter: Chemical Kinetics · Topic: Rate of Reaction

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