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Chemical Kinetics question

2022 · Q118
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Chemical Kinetics question

2022 · Q118

NEETChemistryChemical KineticsMCQ+4 / −1

For a first order reaction A →\to→ Products, initial concentration of A is 0.1 M, which becomes 0.001 M after 5 minutes. Rate constant for the reaction in min−-−1 is

  1. A
    1.3818
  2. B
    0.9212
  3. C
    0.4606
  4. D
    0.2303
View written solutionFree

Correct answer: B

For first order reaction,

$$K = {{2.303} \over t}\log {{[{A_0}]} \over {[A]}}$$; where A0 is the initial concentration of reactant A.

A0 = 0.1 M

A = 0.001 M

t = 5 minute

$$K = {{2.303} \over 5}\log {{0.1} \over {0.001}} = {{2.303} \over 5}\log {10^2}$$

$$ = {{2.303} \over 5} \times 2$$

K = 0.9212 min$-$1

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