The following reaction was carried out at 300 K.

2SO2(g)  +  O2(g) →  2SO3(g)

The rate of formation of SO3 is related to the rate of disappearance of O2  by the following expression:

1. -O2t=+12SO3t                           

2. -O2t=SO3t

3. -O2t=-12SO3t                           

4. None of the above.

Subtopic:  Definition, Rate Constant, Rate Law |
 88%
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Which of the following rate laws has an over all order of 0.5 for the reaction A + B + C → product ?

1. R=k[A].[B].[C]                                            

2. R=k[A]0.5[B]0.5[C]0.5  

3. R=k[A]1.5[B]-1[C]0                                   

4. R=k[A][B]0[C]0.5

Subtopic:  Order, Molecularity and Mechanism |
 87%
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For the system A2g+B2g 2ABg,H=-80kJ If the activation energy for the forward step is 100 kcal/mol.What is the ratio of temperature at which the forward and backward reaction shows the same % change of rate constant per degree rise of temperature ? (1 cal= 4.2 J)

(A) 0.72                                                    

(B) 0.84

(C) 0.42                                                    

(D) 1

Subtopic:  Arrhenius Equation |
 64%
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For a reaction of the type 2A+B 2C, the rate of the reaction is given by kA2B. When the volume of the reaction vessel is reduced to 1/4 th of the original volume, the rate of reaction changes by a factor of

(A) 0.25                                                          

(B) 16

(C) 64                                                             

(D) 4

Subtopic:  Definition, Rate Constant, Rate Law | First Order Reaction Kinetics |
 75%
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From the following data , the orders with respect to A, B, C , respectively, are :

[A] (mol/L)  [B] (mol/L) [C] (mol/L) rate (M/sec.)
0.2 0.1 0.02 8.08 x 10-3
0.1 0.2 0.02 2.01 x 10-3
0.1 1.8 0.18 6.03 x 10-3
0.2 0.1 0.08 6.464 x 10-2


1. -1, 1, 3/2                                     

2. -1, 1, 1/2

3. 1, 3/2,-1                                     

4. 1,-1, 3/2

Subtopic:  Definition, Rate Constant, Rate Law |
 51%
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The elementary reaction A + B → products has k = 2 × 10-5 M-1 s-1 at a temperature of 27 °C. Several experimental runs are carried out using stoichiometric proportion. The reaction has a temperature coefficient value of 2.0. At what temperature should the reaction be carried out if, in spite of halving the concentrations, the rate of reaction is desired to be 50 % higher than in the previous run?

(Given ln6ln2.585)

1. 47 °C                                           

2. 53 °C

3. 57 °C                                           

4. 37 °C

Subtopic:  First Order Reaction Kinetics |
 56%
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When the temperature of a reaction increases from 27 oC to 37 oC, the rate increases by 2.5 times. The activation energy in the temperature range will be:

1. 53.6 kJ                                             

2. 12.61 kJ

3. 7.08 kJ                                             

4. 70.8 kJ

Subtopic:  Arrhenius Equation |
 57%
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For the reaction R-X+OH ROH+X- The rate is given of

Rate=5.0×10-5R-XOH-+0.20×10-5R-X what percentage of R-X Reaction by SN2 mechanism when OH-=1.0×10-2M

1. 96.1%                                                         

2. 3.9%

3. 80%                                                           

4. 20%

Subtopic:  Order, Molecularity and Mechanism |
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The graph that represents a first-order reaction is:

1.  2.
3. 4.
Subtopic:  First Order Reaction Kinetics |
 85%
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The rate of a reaction increases 4-fold when concentration of reactant is increased 16 times.

If the rate of reaction is 4 × 10-6 mol L-1s-1 when concentration of the reactant is 4 × 10-4  mol L-1, the rate constant of the reaction will be : 

1. 2 × 10-4 m1/2 L-1/2 s-1                            

2. 1 × 10-2 s-1

3. 4 × 10-4 mol-1/2 L-1/2 s-1                         

4. 25 mol-1L min-1                              

Subtopic:  First Order Reaction Kinetics |
 58%
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