Chemical Kinetics  MCQs

MCQs of Chemical Kinetics

Showing 211 to 220 out of 228 Questions
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211.
If a reaction occurs in more than one steps which step becomes the rate determining step ?
(a) Initial
(b) Last
(c) Fastest
(d) Slowest
Answer:

Option (d)

212.
What is the unit of rate constant K for first order reaction ?
(a) Time-1
(b) Concentration time-1
(c) (Concentration)2 time-1
(d) (Concentration)1 - n time-1
Answer:

Option (a)

213.
The study of chemical kinetics is difficult for which reaction ?
(a) Very slow
(b) Instantaneous
(c) Slow
(d) Very slow or instantaneous
Answer:

Option (d)

214.
What will be the total order of reaction from the following equation of rate of reaction ?

Rate = K Br- BrO3- H+2

(a) 2
(b) 3
(c) 4
(d) 0
Answer:

Option (c)

215.
What will be the order of reaction for the following reaction rate by Ostwald's isolation method ?

Rate = K0 0.950.5 0.961.5 0.010.5

(a) 2.5
(b) 2
(c) 0.5
(d) 1
Answer:

Option (a)

216.
What will be the order of reaction for Rate = K H2 I2 ?
(a) 1
(b) 0.5
(c) 1.5
(d) 2
Answer:

Option (d)

217.
The rate constant of a first order reaction having 1 M initial concentration is 2.4 × 10-2 sec-1, then what will be its initial reaction rate ?
(a) 2.4 × 10-2 mole litre-1 second-1
(b) 2 × 2.4 × 10-2 mole litre-1 second-1
(c) 0.5 × 10-2 mole litre-1 second-1
(d) 1 × 2.4 × 10-3 mole litre-1 second-1
Answer:

Option (a)

218.
Threshold energy means _____ for the molecules of given reaction.
(a) energy to push
(b) initial kinetic energy
(c) activation energy
(d) kinetic energy of molecules of product
Answer:

Option (a)

219.
For which reaction the decrease in temperature is favorable ?
(a) Exothermic
(b) Endothermic
(c) Reversible reaction
(d) Reverse reaction
Answer:

Option (a)

220.
In Ea = NA · E* what is called NA ?
(a) Complete exponential factor
(b) Avogadro number
(c) Arrhenius constant
(d) Frequency time
Answer:

Option (b)

Showing 211 to 220 out of 228 Questions
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