A zero order reaction is a multi-step reaction

A second order reaction is always a multistep reaction

A first order reaction is always a single step reaction

A zero order reaction is a single step reaction

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

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At 300 K, half life of a gaseous reactant initially at 58 KPa is 320 min. When the pressure is 29 KPa, the half life is 160 mm. The order of the reaction is

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Important Questions on Chemical Kinetics

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Chemistry>Physical Chemistry>Chemical Kinetics>Determination of Order of Reaction

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

\frac{1}{16} t h

value?

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Chemistry>Physical Chemistry>Chemical Kinetics>Determination of Order of Reaction

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

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>Determination of Order of Reaction

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

15 minutes

. The amount of substance left after one hour will be

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Chemistry>Physical Chemistry>Chemical Kinetics>Determination of Order of Reaction

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

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Determination of Order of Reaction

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

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Chemistry>Physical Chemistry>Chemical Kinetics>Determination of Order of Reaction

Decomposition of

H_{2} O_{2}

follows a first order reaction. In fifty minutes the concentration of

H_{2} O_{2}

decreases from

0.5

0.125 M

in one such decomposition. When the concentration of

H_{2} O_{2}

reaches

0.05 M

, the rate of formation of

O_{2}

will be:

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Determination of Order of Reaction

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

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Determination of Order of Reaction

A flask contains a mixture of compounds

A

and

B

. Both compounds decompose by first-order kinetics. The half-lives for

A

and

B

are

300 s

and

180 s

, respectively. If the concentrations of

A

and

B

are equal initially, the time required for the concentration of A to be four times that of

B

(in s) is :

(Use \ln 2 = 0.693)

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Determination of Order of Reaction

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

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Determination of Order of Reaction

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?

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Determination of Order of Reaction

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

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>Determination of Order of Reaction

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) :

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Chemistry>Physical Chemistry>Chemical Kinetics>Determination of Order of Reaction

The rate constant of a first order reaction is

231 \times 10^{- 5} s^{- 1}

. How long will

4 g

of this reactant reduce to

2 g

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Determination of Order of Reaction

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:

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Determination of Order of Reaction

It is true that:

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Determination of Order of Reaction

The half-life for a zero order reaction having

0.02 M

initial concentration of reactant is

100 s

. The rate constant (in

mol L^{- 1} s^{- 1}

) for the reaction is

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Determination of Order of Reaction

The rate constant for a first order reaction is

4.606 \times 10^{- 3} s^{- 1}

. The time required to reduce

2.0 g

of the reactant to

0.2 g

is :

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Determination of Order of Reaction

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>Determination of Order of Reaction

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>Determination of Order of Reaction

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:

At 300 K, half life of a gaseous reactant initially at 58 KPa is 320 min. When the pressure is 29 KPa, the half life is 160 mm. The order of the reaction is

Important Questions on Chemical Kinetics

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