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Chemical Kinetics MCQs for NEET — Chemistry Questions with Answers

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$ A + 2B ---> C + D $ For a reaction from following data correct rat law = Mole
(A) 1 0.1 2 0.3 3 0.3 4 0.4 $ liter ^ {-1} $ (B) 0.1 0.2 0.4 0.1 mole lite-1 min-1 $ 6.0 \times 10^{-3} $ $ 7.2 \times 10^{-2} $ $ 2.88 \times 10^{-1} $ $ 2.4 \times 10^{-2} $

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Explanation

$ Rate = K[A][B]^2 $ Keeping [B] constant, [A] is made a 4 times, rate also become 4 times. Hence rate $ \alpha [A] $ Keeping [A] constant, [B] is doubled, rate becomes 4 times. Hence rate $ \alpha [B] ^ 2$ $ \therefore rate = K[A][B]^ 2$

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In the reaction $ A + B --> Products $ , the doubling of [A], increases the reaction rate to four times, but doubling of [B] has no effect on the reaction rate. The rate expression is ….

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Explanation

$ Rate = K[A][B] ^ 2 $ Keeping [B] constant, [A] is made a 4 times, rate also become 4 times. Hence $ rate \alpha [A] $
Keeping [A] constant, [B] is doubled, rate becomes 4 times. Hence $ rate \alpha [B]^2 $ $ \therefore rate = K[A][B]^2$

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A zero order reaction is one whose rate is independent of ….

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Explanation

concentration of reactants

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The rate constant of a reaction changes when ...

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Explanation

temperature is changed

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Which of the following is a reaction of zero order ?

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Explanation

$ H_2 + Cl_2 \rightarrow 2 HCl $

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Which of the following is a reaction of fractional order ?

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Explanation

$ H_2 + Br_2 \rightarrow 2 HBr $

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A reaction involving two different reactants can never be a ….

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Explanation

Unimolecular reaction

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For a reaction $ 3A \Psi $ Products, the order of reaction

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Explanation

any value between 1 and 3

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The rate determining step in a reaction is $ A + 2B --> C $ . Doubling the concentration of B would make the reaction rate...

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Explanation

$ four times \therefore rate a [B] ^ 2 $

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The rate law of a reaction is $ rate = K [A]^ 2[B] $ . On doubling the concentration of both A and B the rate X will become ...

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Explanation

$ 8 x V_1 = k [A]^2 [B] = x V_2 = k [2A]^2 [2B] $ $ \therefore V_2 = 8x $

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