N O 2 required for a reaction is produced by the decomposition of N 2 O 5 in C C l 4 as per the equation, 2 N 2 O 5 g → 4 N O 2 g + O 2 g . The initial concentration of N 2 O 5 is 3.00 m o l L - 1 and it is 2.75 m o l L - 1 after 30 minutes. The rate of formation of N O 2 is:

1.667 × 10 - 2 m o l L - 1 m i n - 1

8.333 × 10 - 3 m o l L - 1 m i n - 1

4.167 × 10 - 3 m o l L - 1 m i n - 1

2.083 × 10 - 3 m o l L - 1 m i n - 1

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Hydrogen gas, $H_{2} (g)$ , reacts with iodine gas, $I_{2} (g)$ , to form hydrogen iodide, $HI (g)$ :

$H_{2} (g) + I_{2} (g) \to 2 HI (g)$

The mechanism of the two-step reaction is considered to be:

step $1$ : $I_{2} (g) ⇋_{k_{- 1}}^{k_{1}} 2 I (g)$ fast

step $2$ : $2 I (g) + H_{2} (g) \overset{k_{2}}{\to} 2 HI (g)$ slow

What is the rate equation for the overall reaction?

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Important Questions on Chemical Kinetics

HARD

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

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

MEDIUM

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

In the following reaction; $x A \to y B$

$\log_{10} [- \frac{d [A]}{d t}] = \log_{10} [- \frac{d [B]}{d t}] + 0.3010$

‘A’ and ‘B’ respectively can be:

MEDIUM

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

For the following reactions

Question Image

where,

k_{s}

and

k_{e}

, are respectively, the rate constants for substitution and elimination, and

μ = \frac{k_{s}}{k_{e}}

, the correct option is ________

EASY

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

Consider the following reactions
$A \to P 1; B \to P 2; C \to P 3; D \to P 4$
The order of the above reactions are $a, b, c and d,$ respectively. The following graph is obtained when log[rate] vs.log[conc.] are plotted:

Question Image
Among the following, the correct sequence for the order of the reactions is :

EASY

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

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?

HARD

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

The results given in the below table were obtained during kinetic studies of the following reaction: $2 A + B \to C + D$

Experiment	$[A] / {molL}^{- 1}$	$[B] / {molL}^{- 1}$	Initial rate/ ${molL}^{- 1} \min^{- 1}$
I	$0.1$	$0.1$	$6.00 \times 10^{- 3}$
II	$0.1$	$0.2$	$2.40 \times 10^{- 2}$
III	$0.2$	$0.1$	$1.20 \times 10^{- 2}$
IV	X	$0.2$	$7.20 \times 10^{- 2}$
V	$0.3$	Y	$2.88 \times 10^{- 1}$

X and Y in the given table are respectively :

EASY

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

For a chemical reaction rate law is, rate

= K {[A]}^{2} [B] .

If [A] is doubled at constant

[B],

the rate of reaction.

EASY

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

For a first order reaction

(A ⟶ P)

the rate constant is

5 \times 10^{- 3} \min^{- 1}

when the initial concentration of

A = 2 \times 10^{- 2} M

. If the initial concentration of

A

is doubled, what will be the rate constant (in

\min^{- 1}

) at the same temperature?

EASY

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

The rate law for the reaction below is given by the expression

k [A] [B]

A + B \to P r o d u c t

If the concentration of

B

is increased from

0.1 to 0.3 mol

, keeping the value of

A

0.1 mol

, the rate constant will be:

HARD

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

The reaction of ozone with oxygen atoms in the presence of chlorine atoms can occur by a two step process shown below:

O_{3} (g) + {Cl}^{•} \to O_{2} (g) + {ClO}^{•} (g)

...(i)

k_{i} = 5.2 \times 10^{9} L m o l^{- 1} s^{- 1}

{ClO}^{•} (g) + O^{•} (g) \to O_{2} (g) + {Cl}^{•} (g)

...(ii)

k_{i i} = 2.6 \times 10^{10} L m o l^{- 1} s^{- 1}

The closest rate constant for the overall reaction

O_{3} (g) + O^{•} (g) \to 2 O_{2} (g)

is:

EASY

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

Which of the following expression is correct for the rate of reaction given below ?

$5 {Br}^{-} (aq) + {BrO}_{3}^{-} (aq) + 6 H^{+} (aq) ⟶ 3 {Br}_{2} (aq) + 3 H_{2} O (l)$

MEDIUM

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

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}}

MEDIUM

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

The rate constant for a second order reaction,

A \to

Product, is

1.62 M^{- 1} s^{- 1}

. What will be the rate of reaction when concentration of reactant is

2 \times 10^{- 3} M

MEDIUM

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

For the reaction

2 H_{2} (g) + 2 N O (g) \to N_{2} (g) + 2 H_{2} O (g)

the observed rate expression is, rate

= k_{f} {[NO]}^{2} [H_{2}]

. The rate expression for the reverse reaction is:

MEDIUM

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

Which one of the following statements is not correct?

MEDIUM

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

27 ° C

temperature, time required for

75 %

completion of a first order reaction is

20

seconds. What will be its rate constant?

EASY

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

The unit of second order reaction rate constant is;

EASY

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

N O_{2}

required for a reaction is produced by the decomposition of

N_{2} O_{5}

C C l_{4}

as per the equation,

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

The initial concentration of

N_{2} O_{5}

3.00 m o l L^{- 1}

and it is

2.75 m o l L^{- 1}

after 30 minutes. The rate of formation of

N O_{2}

is:

MEDIUM

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

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

EASY

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

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

Hydrogen gas, H2(g), reacts with iodine gas, I2(g), to form hydrogen iodide, HI(g): H2(g) + I2(g) → 2HI(g) The mechanism of the two-step reaction is considered to be: step 1: I2(g) ⇋k-1k1 2I(g) fast step 2: 2I(g) + H2(g) →k2 2HI(g) slow What is the rate equation for the overall reaction?

Important Questions on Chemical Kinetics

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