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%
From NCERT
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If ‘a’ is the initial concentration of a substance which reacts according to zero-order kinetics and k is the rate constant, the time for the reaction to go to completion will be:

1. a/k 2. 2/ka
3. k/a 4. Infinite
Subtopic:  Definition, Rate Constant, Rate Law | First Order Reaction Kinetics |
 76%
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The decomposition of a gaseous compound yields the following information:

Initial pressure, atm 1.6 0.8 0.4
Time for 50 % reaction, min 80 113 160
The order of the reaction will be:
1. 1.0 2. 1.5
3. 2.0 4. 0.5
Subtopic:  Definition, Rate Constant, Rate Law |
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For a given reaction the concentration of the reactant plotted against time gave a straight line with negative slope.

The order of the reaction will be:

1. 3                                                      

2. 2

3. 1                                                      

4. 0

Subtopic:  Order, Molecularity and Mechanism |
 65%
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The rate constant of a first order reaction is generally determined from a plot of 

(1) Concentration of reactant vs time t

(2) log (concentration of reactant) vs time t

(3) 1concentration of reactantvs time t

(4) Concentration of reactant vs log time t

Subtopic:  First Order Reaction Kinetics |
 78%
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The relationship between temperature and the variance in reaction rate is:

1.  2.
3. 4.
Subtopic:  Arrhenius Equation |
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The plot of log k versus 1T is linear with a slope of

(1) EaR                                                    

(2) -EaR

(3) Ea2.303R                                             

(4) -Ea2.303R

Subtopic:  Arrhenius Equation |
 81%
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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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