If a reaction A + B  C is exothermic to the extent of 30 kJ/mol and the forward reaction has an activation energy of 70 kJ/mol, the activation energy for the reverse reaction will be:

1. 30 kJ/mol                                       

2. 40kJ/mol

3. 70 kJ/mol                                       

4. 100 kJ/mol

Subtopic:  Arrhenius Equation |
 74%
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A first-order reaction takes 40 min for 30 % decomposition. The t1/2 for this reaction will be:

1. 77.7 min 2. 27.2 min
3. 55.3 min 4. 67.3 min
Subtopic:  First Order Reaction Kinetics |
 61%
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For a certain reaction involving a single reactant, it is found that C0T is constant where C0is the initial concentration of the reactant and T is the half-life. What is the order of the reaction ?

(1) 1                                              

(2) Zero

(3) 2                                              

(4) 3

Subtopic:  Order, Molecularity and Mechanism |
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The high temperature ( 1200K) decomposition of CH3COOH(g) occurs as follows as per simultaneous 1st order reactions.

CH3COOH k1 CH4+ CO2

CH3COOH k2 CH2CO + H2O

What would be the % of CH4by mole in the product mixture (excludingCH3COOH)?

1. 50 k1k1+k2                                            

2. 100 k1k1+k2

3. 200 k1k1+k2                                           

4. it depends on the time

Subtopic:  First Order Reaction Kinetics |
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The reaction , A(g) + 2B(g) C(g) + D(g) is an elementary process. In an experiment, the initial partial pressure of A and B are PA= 0.60 and PB= 0.80 atm. When PC= 0.2atm the rate of reaction relative to the initial rate is

(1) 1/48                                                               

(2) 1/24

(3) 9/16                                                              

(4) 1/6

 

Subtopic:  First Order Reaction Kinetics |
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The half-life period for a first-order reaction is 20 minutes. The time required to change the concentration of the reactants from 0.08 M to 0.01 M will be:

1. 20 minutes 2. 60 minutes
3. 40 minutes 4. 50 minutes
Subtopic:  First Order Reaction Kinetics |
 82%
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The kinetic data for the reaction: 2A + B2 → 2AB are as given below

[A]/mol L-1 [B2]/mol L-1 Rate/mol L-1s-1
0.5 1.0 2.5 × 10-3
1.0 1.0 5.0 × 10-3
0.5 2.0 1 × 10-2

The order of reaction with respect to A and B2 is, respectively:

1. 1 and 2 2. 2 and 1
3. 1 and 1 4. 2 and 2
Subtopic:  Order, Molecularity and Mechanism |
 78%
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For the irreversible unimolecular type reaction A kproducts in a batch reactor, 80% reactant A(CA0 = 1 mole/lit.)is converted in a 480 second run and conversion is 90% after 18 minute. The order of this reaction is-

(A) 1                                                       

(B) 2

(C) 1/2                                                   

(D) 3/2

Subtopic:  First Order Reaction Kinetics |
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The rate constant, the activation energy, and the Arrhenius parameter of a chemical reaction at 25°C are 3.0×10-4 s-1104.4 kJ mol-1 and 6.0×1014s-1 respectively.
The value of the rate constant as T → ∞ will be:

1. 2.0 × 1018 s-1                                                  

2. 6.0 × 1014 s-1

3.                                                                    

4. 3.6 × 1030 s-1

Subtopic:  Arrhenius Equation |
 73%
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The gas phase decomposition 2N2O5 → 4NO2 + O2 follows the first order rate law, K = 7.5 × 10-3 sec-1. The initial pressure of N2O5 is 0.1 atm. The time of decomposition of N2Oso that the total pressure becomes 0.15 atm will be -

1. 54 sec 2. 5.4 sec
3. 3.45 sec 4. 34.55 sec
Subtopic:  First Order Reaction Kinetics |
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