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

HARD

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Which of the following statements are correct?

1. Order of a reaction can be known from experimental result and not from the stoichiometry of reaction

2. Overall molecularity of a reaction may be determined in a manner similar to overall order of reaction

3. Overall order of reaction,

$A^{m} + B^{n} \to A B_{x}$ is $(m + n)$

4. Molecularity of a reaction refers to

(i) Molecularity of each of the elementary steps (slow steps) in a multistep reaction

(ii) Molecularity of that particular step in a single step reaction

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Important Questions on Chemical Kinetics

MEDIUM

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

Rate

= K [H_{2} O_{2}]

is an example of

EASY

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

The kinetic order for the following reaction is:

$2 N_{2} O (g) \overset{Pt}{\to} 2 N_{2} (g) + O_{2} (g)$

EASY

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

The overall order of reaction which has rate expression, Rate

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

HARD

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

In the reaction,

P + Q \to R + S

the time taken for

75 %

reaction of

P

is twice the time taken for

50 %

reaction of

P

. The concentration of

Q

varies with reaction time as shown in the figure.The overall order of the reaction is:

Question Image

EASY

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

In a chemical reaction

A + 2 B \to

products, when concentration of

A

is doubled, rate of the reaction increases

4

times and when concentration of

B

alone is doubled rate continues to be the same. The order of the reactions is

EASY

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

Rate

= K {[A]}^{1 / 2} {[B]}^{3 / 2} {[C]}^{- 1}

order of the reaction is

MEDIUM

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

The sum of the powers of the concentration term that occur in the rate equation is called:

EASY

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

The reaction

2 NO (g) + O_{2} (g) \to 2 {NO}_{2} (g)

is of the first-order. If the volume of the reaction vessel is reduced to

1 / 3,

the rate of the reaction would be

EASY

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

aP + bQ \to Products

, when

[P]

is doubled keeping

|Q|

constant rate increases

2

times, when

[P]

is constant and

|Q|

is doubled, rate increases four times. The overall order is

MEDIUM

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

The rate of a reaction is found to depend upon two concentration variables. What should be the order of the reaction?

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Order of a 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

MEDIUM

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

For the chemical reaction

$2 O_{3} ⟶ 3 O_{2}$ , the reaction proceeds as follows

$O_{3} ⇌ O_{2} + O$ (Fast)

$O + O_{3} ⟶ 2 O_{2}$ , (Slow)

the rate law expression should be given as

MEDIUM

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

If rate constant for a reaction is

mol {litre}^{- 1} {second}^{- 1}

then order of reaction is

EASY

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

It is true that:

EASY

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

One gram of (

A

) decays by

β

-emission to

0.125 g

200

years. The half-life period of the reaction is

MEDIUM

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

The time required for

60 %

completion of a first order reaction is

50 \min

. The time required for

93.6 %

completion of the same reaction will be

EASY

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

For a certain reaction between

X

and

Y,

the order with respect to

X

3

and that with respect to

Y

4 .

If the concentrations of both

X

and

Y

are tripled. the rate of reaction will increase by a factor of ________

EASY

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

The rate constant is same for

3

reactions of order

I

II

and

III

, respectively, the unit of concentration being in moles per litre. If the concentration of the reactant is unity, the rates of reaction

R_{1}, R_{2}, R_{3}

will be

EASY

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

For the elementary reaction

M \to N

, the rate of disappearance of

M

increases by a factor of

8

upon doubling the concentration of

M

. The order of the reaction with respect to

M

Important Questions on Chemical Kinetics

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