Chemical Kinetics-Activation Energy (NEET Chemistry): Questions 1 - 5 of 7

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Question number: 1

» Chemical Kinetics » Activation Energy

MCQ▾

Question

Activation energy of a reaction is?

Choices

Choice (4) Response

a.

The energy needed to form one mole of product

b.

The energy released during the reaction

c.

The energy evolved when activation complex is formed

d.

Minimum amount of energy needed to overcome potential barrier

Question number: 2

» Chemical Kinetics » Activation Energy

MCQ▾

Question

The activation energy of a reaction can be lowered by?

Choices

Choice (4) Response

a.

Decreasing temperature

b.

Using a positive catalyst

c.

Increasing reactants concentration

d.

Increasing temperature

Question number: 3

» Chemical Kinetics » Activation Energy

MCQ▾

Question

For N2(g)+3H2(g)2NH3(g)+22kcal,Ea for the reaction is 70 kcal. Hence, the activation energy for 2NH3(g)N2(g)+3H2(g) is?

Choices

Choice (4) Response

a.

72 kcal

b.

22 kcal

c.

92 kcal

d.

48 kcal

Question number: 4

» Chemical Kinetics » Activation Energy

MCQ▾

Question

Which equation is true to calculate the energy of activation, if the rate of reaction is doubled by increasing temperature from T1 to T2 K?

Choices

Choice (4) Response

a.

log102=Ea2.303R[1T11T2]

b.

log10(k1/k2)=Ea2.303R[1T21T1]

c.

log10(k1/k2)=Ea2.303R[1T11T2]

d.

log10(1/2)=Ea2.303R[1T11T2]

Question number: 5

» Chemical Kinetics » Activation Energy

MCQ▾

Question

In a reaction, the threshold energy is equal to?

Choices

Choice (4) Response

a.

Average kinetic energy of molecules of reactants

b.

Activation energy + initial energy of reactants

c.

Initial energy of reactants

d.

Activation energy - normal energy of reactants

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