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Chemical Kinetics question

2005 · Q94
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Chemical Kinetics question

2005 · Q94

NEETChemistryChemical KineticsMCQ+4 / −1
The rate of reaction between two reactions A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of this reaction with respect to reactant B is
  1. A
    2
  2. B
    −-−2
  3. C
    1
  4. D
    −-−1
View written solutionFree

Correct answer: B

A + B →\to→ Product

Rate ∝\propto∝ [A]x [B]y .......(1)

The rate of the reaction decreases by a factor of 4 if the concentration of reactant B is doubled.

r4{r \over 4}4r​ ∝\propto∝ [A]x [2B]y ......(2)

From equation (1) and (2), we get

(12)y=4{\left( {{1 \over 2}} \right)^y} = 4(21​)y=4

⇒\Rightarrow⇒ y = -2

∴\therefore∴ Order of this reaction with respect to reactant B is -2.

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