Under what condition the order of the reaction, 2 H I → H 2 g + I 2 g , is zero

At high partial pressure of H I

At high partial pressure of H 2

At high partial pressure of I 2

For the reaction, 2 A + B → products, when the concentration of A and B both were doubled, the rate of the reaction increased from 0.3 m o l L - 1 s - 1 to 2.4 m o l L - 1 s - 1 . When the concentration of A alone is doubled, the rate increased from 0.3 m o l L - 1 s - 1 to 0.6 m o l L - 1 s - 1 . Which one of the following statements is correct?

Order of the reaction with respect to B is 2

Total order of the reaction is 4

Order of the reaction with respect to A is 2

Order of the reaction with respect to B is 1

EASY

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Integrated rate law equation for a first order gas phase reaction is given by (where $P_{i}$ is initial pressure and $P_{t}$ is total pressure at time $t$ )

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Important Questions on Chemical Kinetics

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

The rate constant for a first order reaction is

7 .0 \times 10^{- 4} s^{- 1} .

If initial concentration of the reactant is

0.080 M

, what is the half-life of the reaction?

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is:

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

It takes

1 h

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

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

Find the unit of the rate constant of a reaction represented with a rate equation, rate

= k {[A]}^{\frac{1}{2}} {[B]}^{\frac{3}{2}}

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

For an elementary chemical reaction, $A_{2} ⇄_{k_{- 1}}^{k_{1}} 2 A$ , the expression for $\frac{d [A]}{dt}$ is:

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

Under what condition the order of the reaction,

2 H I \to H_{2} (g) + I_{2} (g),

is zero

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

If 50 % of a reaction occurs in 100 second and 75 % of the reaction occurs in 200 second, the order of this reaction is:

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

A first-order reaction has a specific reaction rate

10^{- 2} \sec^{- 1} .

How much time will it take for

20 g

the reactant to reduce to

5 g

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

The rate constant of the reaction

A ⟶ B

0.6 \times 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

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

The reaction

2 N_{2} O_{5} (g) \to 4 N O_{2} (g) + O_{2} (g)

follows first order kinetics. The pressure of a vessel containing only

N_{2} O_{5}

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) :

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

The data given below are for the reaction of

A

and

D_{2}

to form product at

295 K

. Find the correct rate expression for this reaction

$\frac{D_{2}}{m o l L^{- 1}}$	$\frac{A}{m o l L^{- 1}}$	$\frac{I n i t i a l r a t e}{m o l L^{- 1} s^{- 1}}$
$0.05$	$0.05$	$1 \times 10^{- 3}$
$0.15$	$0.05$	$3 \times 10^{- 3}$
$0.05$	$0.15$	$9 \times 10^{- 3}$

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

Decomposition of

X

exhibits a rate constant of

0 .05 μg / year

. How many years are required for the decomposition of

5 μg

X

into

2 .5 μg

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

For a zero - order reaction with rate constant k, the slope of the plot reactant concentration against time is

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

Which among the following reactions can be an example of pseudo first order reaction?

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

Mechanism of a hypothetical reaction

X_{2} + Y_{2} \to 2 XY

is given below:

(i)

X_{2} \to X + X (fast)

(ii)

X + Y_{2} ⇌ XY + Y (slow)

(iii)

X + Y \to XY (fast)

The overall order of the reaction will be

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

518^{o} C,

the rate of decomposition of a sample of gaseous acetaldehyde, initially at a pressure of

363 Torr

was

1 .00 Torr s^{- 1}

when

5 %

had reacted and

0 .50 Torr s^{- 1}

when 33% had reacted. The order of the reaction is:

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

The half-life period of a first-order reaction is

15 minutes

. The amount of substance left after one hour will be

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

A + 2 B \to C

, the rate equation for the reaction is given as

Rate

= k [A] [B]

If the concentration of A is kept the same but that of B is doubled what will happen to the rate itself?

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

For the reaction,

2 A + B \to

products, when the concentration of

A

and

B

both were doubled, the rate of the reaction increased from

0.3 m o l L^{- 1} s^{- 1}

2.4 m o l L^{- 1} s^{- 1} .

When the concentration of

A

alone is doubled, the rate increased from

0.3 m o l L^{- 1} s^{- 1}

0.6 m o l L^{- 1} s^{- 1} .

Which one of the following statements is correct?

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Dependence of Rate on Reactant Concentrations

The rate of a first-order reaction is

0.04 m o l l^{- 1} s^{- 1}

10

second and

0.03 m o l l^{- 1} s^{- 1}

20

seconds after initiation of the reaction. The half-life period of the reaction is:

Integrated rate law equation for a first order gas phase reaction is given by (where Pi is initial pressure and Pt is total pressure at time t)

Important Questions on Chemical Kinetics

Learn and Prepare for any exam you want !

Integrated rate law equation for a first order gas phase reaction is given by (where $P_{i}$ is initial pressure and $P_{t}$ is total pressure at time $t$ )