Chemical Kinetics Test

Result

Chemical Kinetics Test - 28

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Weekly Quiz Competition

Question 1
4 / -1

In a first order reaction the concentration of the reactant decreases from 800 mol/dm³ to 50 mol/dm³ in 2 × 10⁷ sec. The rate constant of the reaction in sec^-1 is

A

B

C

D

Solution
Question 2
4 / -1

An endothermic reaction A → B has an activation energy of 15 kcal/mole and the energy of reaction is 5 kcal/mole. The activation energy for the reaction B → A is

A
20 kcal/mole

B
15 kcal/mole

C
10 kcal/mole

D
zero

Solution
Question 3
4 / -1

The rate constant of a reaction at temperature 200 K is 10 times less than the rate constant at 400 K. What is the activation energy (E_a) of the reaction?

A
1842.4 R

B
921.2 R

C
460.6 R

D
230.3 R

Solution
Question 4
4 / -1

In a second order reaction, first order in each reactant A and B, which one of the following reactant mixtures will provide the highest initial rate?

A
0.1 mol of A and 0.1mol of B in 0.1 litre solvent

B
0.2 mol of A and 0.2 mol of B in 0.1 litre solvent

C
1.0 mol of A and 1.0 mol of B in 1 litre solvent

D
0.1 mol of A and 0.1 mol of B in 0.2 litre solvent
Question 5
4 / -1

The rate law for the reaction RCl + NaOH →ROH + NaCl is given by Rate = k [RCl]. The rate of this reaction

A
is doubled by doubling the concentration of NaOH

B
is halved by reducing the concentration of RCl by one half

C
is increased by increasing the temperature of the reaction

D
in unaffected by change in temperature
Question 6
4 / -1

A reaction has a rate constant of 0.5 mol^-1 dm³ min^-1. If initial concentration of the reactant is 0.2 mol dm^-3, half life of the reaction is

A
1.4 min

B
10 min

C
15 min

D
20 min

Solution
Question 7
4 / -1

The rate constant of nth order has units

A

B

C

D

Solution
Question 8
4 / -1

A
E₁ > E₂

B
E₁ < E₂

C
E₁ = 2E₂

D
E₁ = E₂
Question 9
4 / -1

Consider the following statements: For a second order reaction: 2A → P

A
1 and 2

B
1 and 3

C
2 and 3

D
1, 2 and 3

Solution
Question 10
4 / -1

The rate of reaction of spontaneous reaction is generally very slow. This is due to the fact that..

A
the equilibrium constant of the reaction is < 1

B
the activation energy of the reaction is large

C
the reaction are exothermic

D
the reaction are endothermic