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NEET 2005
Exam
NEET
Year
2005
Subject
Chemistry
Chapter
Chemical Kinetics

NEET 2005 · Chemistry · Chemical Kinetics

The rate of reaction between two reactants A and B decreases by a...

The rate of reaction between two reactants A\mathrm{A} and B\mathrm{B} decreases by a factor of 4 if the concentration of reactant BB is doubled. The order of this reaction iwth respect is reactant B\mathrm{B} is:

Options

  1. A2
  2. B-2
  3. C1
  4. D-1

Correct answer

B. -2

Step-by-step solution

Rate of reaction =K[A0]α[B0]β=\mathrm{K}\left[\mathrm{A}_0\right]^\alpha\left[\mathrm{B}_0\right]^\beta[B]=2[B0]r1r2=K[A0]α[B0]β[A0]α[2B0]β;4=(12)β=β=−2.\begin{aligned} {[\mathrm{B}]} & =2\left[\mathrm{ B}_{0}\right] \\ \frac{r_1}{r_2}& =\frac{\mathrm{K}\left[\mathrm{A}_0\right]^\alpha\left[\mathrm{B}_0\right]^\beta}{\left[\mathrm{A}_0\right]^\alpha\left[2 \mathrm{ B}_0\right]^\beta}; \\ 4 & =\left(\frac{1}{2}\right)^\beta=\beta=-2 . \end{aligned}
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