For a reaction A           Product, rate law is -d[A]dt=K[A]0. The concentration of A left after time t when t=1K is:

1. [A]0e

2. [A]0 ×e

3. [A]0e2

4. 1[A]0

Subtopic:  First Order Reaction Kinetics |
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For an exothermic chemical process occurring in two steps as;

(i) A+BX(Slow)

(ii) XAB (Fast)

The progress of the reaction can be best described by:

1. 

2. 

3. 

4. All of the above.

Subtopic:  Arrhenius Equation |
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For the non-stoichiometric reaction 2A + B  C +D, the following kinetic data were obtained in three separate experiments, all at 298 K.

 Initial 

Concentration (A)

 Initial Concentration (B)  Initial rate of formation of C (mol L-1 S-1)
         0.1 M         0.1 M  1.2×10-3
         0.1 M         0.2 M 1.2×10-3
         0.2 M         0.1 M  2.4×10-3

 

The rate law for the formation of C is:

1. d[C]/dt = k[ A][B]

2. d[C]/dt = k[ A]2[B]

3. d[C]/dt = k[ A][B]2

4. d[C]/dt = k[ A]

Subtopic:  Order,Molecularity and Mechanism |
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For the reaction N2 + 3H2  2NH3, the rate d[NH3]dt= 2 x 10-4 M s-1 .Therefore, the rate -d[N2]dt is given as:

1. 10-4 Ms-1

2. 104 Ms-1

3. 10-2 sM-1

4. 10-4 sM-1

Subtopic:  Definition, Rate Constant, Rate Law |
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If 'I' is the intensity of absorbed light and 'c' is the concentration of AB for the photochemical process AB + hv→  AB *, the rate of formation of AB * is directly proportional to:

1. c

2. I

3. I2

4. cI

Subtopic:  Definition, Rate Constant, Rate Law |
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Which curve represents zero order reaction?

1. 

2. 

3. 

4. 

Subtopic:  Order,Molecularity and Mechanism |
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In a reaction, the rate expression is, rate = K[A][B]2/3[C]0 , the order of reaction is:

1. 1

2. 2

3. 5/3

4. zero

Subtopic:  Order,Molecularity and Mechanism |
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The rate of a reaction get doubles when the temperature changes from 7°C to 17°C. By what factor will it change for the temperature change from 17°C to 27°C?

1. 1.81

2. 1.71

3. 1.91

4. 1.76

Subtopic:  Arrhenius Equation |
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In the Arrhenius equation K = Ae-Ea/RT, the quantity e-Ea/kT is referred as:

1. Boltzmann factor.

2. Frequency factor.

3. Activation factor.

4. None of the above.

Subtopic:  Arrhenius Equation |
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For the elementary step,

(CH3)3.CBr(aq) → (CH3)3C+ (aq) + Br- (aq) the molecularity is:

1. zero

2. 1

3. 2

4. cannot ascertained

Subtopic:  Order,Molecularity and Mechanism |
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