EASY
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The unit of the rate constant of a third-order chemical reaction is

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Important Questions on Chemical Kinetics

EASY
The rate constant for a first order reaction is 7.0×10-4 s-1. If initial concentration of the reactant is 0.080 M, what is the half-life of the reaction?
MEDIUM
What is the correct difference between first and second order reactions?
EASY
It takes 1h for a first order reaction to go to 50% completion. The total time required for the same reaction to reach 87.5%  completion will be
EASY
A first-order reaction has a specific reaction rate 10-2sec-1. How much time will it take for 20 g the reactant to reduce to 5 g?
MEDIUM
The rate of a first-order reaction is 0.04 mol l-1s-1 at 10 second and 0.03 mol l-1s-1 at 20 seconds after initiation of the reaction. The half-life period of the reaction is:
MEDIUM
For a zero - order reaction with rate constant k, the slope of the plot reactant concentration against time is
EASY
If 50 % of a reaction occurs in 100 second and 75 % of the reaction occurs in 200 second, the order of this reaction is:
MEDIUM
Decomposition of H2O2 follows a first order reaction. In fifty minutes the concentration of H 2 O 2 decreases from 0.5 to 0.125 M in one such decomposition. When the concentration of H2O2 reaches 0.05 M , the rate of formation of O2 will be:
EASY
The rate constant of the reaction AB is 0.6×10-3 mole per liter per second. If the initial concentration of A is 5 M, then the concentration of B after 20 minutes is:
HARD
The reaction 2N2O5g4NO2g+O2(g) follows first order kinetics. The pressure of a vessel containing only N2O5 was found to increase from 50 mm Hg to 87.5 mm Hg in 30 min. The pressure exerted by the gases after 60 min. Will be (Assume temperature remains constant) :
MEDIUM
The half-life period of a first-order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be log2=0.301
EASY
The half-life of the first-order reaction, CH3CHO (g)CH4 (g)+CO (g), if the initial pressure of CH3CHO (g) is 80mm Hg and the total pressure at the end of 20 minutes is 120mm Hg, is:
HARD
The half-life period of a first-order reaction is 15 minutes. The amount of substance left after one hour will be
EASY
Under what condition the order of the reaction,

2HIH2g+I2g, is zero
MEDIUM
The rate constant for the first order reaction is 60 s-1. How much time will it take to reduce the concentration of the reactant to 116 th value?
MEDIUM

The given plots represent the variation of the concentration of a reactant R with time for two different reactions (i) and (ii). The respective orders of the reaction are
(i) Question Image

(ii) Question Image

MEDIUM
If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction is given by
EASY
When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is:
HARD
N2O5 decomposes to NO2 and O2 follows the first order kinetics. After 50 minutes, the pressure inside the vessel increases from 50 mm Hg to 87.5 mm Hg. The pressure of the gaseous mixture after 100 minutes at constant temperature will be:
EASY
When initial concentration of the reactant is doubled, what happens to the half-life period of a zero order reaction?