Q19 / 150 · MHT CET 2022 (05 Aug Shift 1) · Chemistry

Calculate rate constant of zero order reaction if it is $90 \%$ completed in 90 second?

  • A
    $0.1 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{~s}^{-1}$
  • Correct answer
    B
    $1.0 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{~s}^{-1}$
  • C
    $0.9 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{~s}^{-1}$
  • D
    $0.09 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{~s}^{-1}$

Solution

For zero order rx ${ }^n$ $\begin{aligned} & \mathrm{x}=\mathrm{kt} \\ & 90=\mathrm{k} \times 90 \\ & \mathrm{k}=\frac{1 \mathrm{~mol}}{\mathrm{dm}^3-\mathrm{sec}}\end{aligned}$

Hence, the correct answer is option: 'B'.

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