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Chemistry MCQs for NEET — Practice Questions with Answers

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The rate constant of a reaction changes when ...

A. pressure is changed B. concentration of reactants changed C. temperature is changed D. a catalyst is added

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Explanation

temperature is changed

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Which of the following is a reaction of zero order ?

A. $ H_2 + Cl_2 \rightarrow 2HCl $ B. $ 2 N_2 O_5 \rightarrow 4 NO_2 + O_2 $ C. $ 2 HI \rightarrow H_2 + I_2 $ D. $ H_2 + Br_2 \rightarrow 2 HBr $

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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 ?

A. $ 2 N_2 O_5 \rightarrow 4 NO_2 + O_2 $ B. $ 2NO_2 + F_2 \rightarrow 2 NO_2 F $ C. $ H_2 + Br_2 \rightarrow 2 HBr $ D. $ 2 NO + O_2 \rightarrow 2 NO_2 $

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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 â€¦.

A. bimolecular reaction B. Unimolecular reaction C. first order reaction D. second order reaction

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Explanation

Unimolecular reaction

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

A. 3 B. 1 ,2 or 3 C. zero D. any value between 1 and 3

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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...

A. two times B. same rate C. 4 times D. 1/4 times

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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 ...

A. $ x ^ 3 $ B. 8x C. $ 4 x^ 2 $ D. 9x

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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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For the reaction $ CH_3COCH_3 + I_2 + H^+ --> Products $ , the rate is governed by, $ rate = K[CH_3COCH_3] [H^+]$ . The rate order of iodine is = _.

A.

3

B.

2

C.

1

D.

0

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Explanation

$ OO \therefore No I_2 $ in the rate law equation.

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If the order of reaction is zero. It means that

A. rate of reaction is independent of temperature B. rate of reaction is independent of the concentration of the reacting species C. the rate of formation of activated complex is zero D. the rate of decomposition of activated complex is zero

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Explanation

rate of zero order reaction is independent of the concentration of the reacting species

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The reactions of higher order are rare because

A. many body collisions involve very high activation energy B. many body collisions have a low probability C. many body collisions are not energetically favoured D. many body collisions can take place only in the gaseous phase.

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Explanation

many body collisions have a low probability

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