Chemical Kinetics Test

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Chemical Kinetics Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

The rate constant, the activation energy and the Arrhenius parameter of a chemical reaction at 50^oC are 7.3 × 10⁴ s^-1, 18.23 KJ mol^-1 and 6.0 × 10⁴ s^-1, respectively. The value of the rate constant as T approaches ∞ is

A
6.479 × 10⁷ s^-1

B
8.22 × 10¹ s^-1

C
8.105 × 10²³ s^-1

D
infinity
Question 2
1 / -0

In a chemical reaction, if a linear (y = mx) graph is obtained between half-life and concentration of reactants, then what is the order of the reaction?

A
0

B
1

C
3

D
2
Question 3
1 / -0

The units of rate of reaction and its rate constant

A
are identical

B
are quite independent of each other

C
depend on the experimental conditions of the reaction

D
are related to each other through a definite expression depending upon the order of the reaction
Question 4
1 / -0

The half-life of a zero-order reaction A → B is

A
directly proportional to the concentration of A

B
independent of the concentration of A

C
inversely proportional to the concentration of A

D
determined by the concentration of B

Question 5

1 / -0

Match the following:

Column – I	Column – II
(A) Zero-order reaction	(a) High activation energy
(B) Pseudo unimolecular reaction	(b) Decreases activation energy
(C) Slow reaction	(c) Decomposition of ammonia on tungsten
(D) Positive catalyst	(d) Hydrolysis of cane sugar

(A) – (c), (B) – (d), (C) – (a), (D) – (b)

(A) – (d), (B) – (a), (C) – (c), (D) – (b)

(A) – (c), (B) – (b), (C) – (a), (D) – (d)

(A) – (a), (B) – (d), (C) – (c), (D) – (b)

Question 6
1 / -0

The temperature coefficient of a reaction is

A
the rate constant at a fixed temperature

B
the ratio of the rate constants at two different temperatures

C
the ratio of the rate constants at temperatures differing by at least 25^oC

D
the ratio of the rate constants at temperatures differing by 10^oC (say from 25^oC to 35^oC)
Question 7
1 / -0

The activation energy in a chemical reaction is defined as

A
the difference in energies of reactants and products

B
the sum of energies of reactants and products

C
the difference in energies of intermediate complexes with the average energy of reactants and products

D
the difference in energies of intermediate complexes and the average energy of reactants
Question 8
1 / -0

Molecularity of a reaction

A
Cannot be less than 2

B
Can be zero

C
Is always a whole number

D
Can have a fractional values

Solution

Molecularity means minimum no. of atoms molecules or ions which undergo collision for conversion of reactant to Product. So it is a whole no. Cannot be fractional or negative.
Question 9
1 / -0

On increasing the pressure three folds, the rate of reaction, 2H₂S + O₂ → products, would increase by how many times?

A
3 times

B
9 times

C
12 times

D
27 times

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Chemical Kinetics Test - 2

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Chemical Kinetics Test - 2

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Question 1

6.479 × 107 s-1

8.22 × 101 s-1

8.105 × 1023 s-1

infinity

Question 2

0

1

3

2

Question 3

are identical

are quite independent of each other

depend on the experimental conditions of the reaction

are related to each other through a definite expression depending upon the order of the reaction

Question 4

directly proportional to the concentration of A

independent of the concentration of A

inversely proportional to the concentration of A

determined by the concentration of B

Question 5

(A) – (c), (B) – (d), (C) – (a), (D) – (b)

(A) – (d), (B) – (a), (C) – (c), (D) – (b)

(A) – (c), (B) – (b), (C) – (a), (D) – (d)

(A) – (a), (B) – (d), (C) – (c), (D) – (b)

Question 6

the rate constant at a fixed temperature

the ratio of the rate constants at two different temperatures

the ratio of the rate constants at temperatures differing by at least 25oC

the ratio of the rate constants at temperatures differing by 10oC (say from 25oC to 35oC)

Question 7

the difference in energies of reactants and products

the sum of energies of reactants and products

the difference in energies of intermediate complexes with the average energy of reactants and products

the difference in energies of intermediate complexes and the average energy of reactants

Question 8

Cannot be less than 2

Can be zero

Is always a whole number

Can have a fractional values

Solution

Question 9

3 times

9 times

12 times

27 times

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6.479 × 10⁷ s^-1

8.22 × 10¹ s^-1

8.105 × 10²³ s^-1

the ratio of the rate constants at temperatures differing by at least 25^oC

the ratio of the rate constants at temperatures differing by 10^oC (say from 25^oC to 35^oC)