The rate of a reaction increases 4-fold when when concentration of reactant is incresed 16 times. If the rate of reaction is 4×10-6 mole L-1S-1mole L-1when concentration of the reactant is 4×10-4, the rate constant of the reaction will be

(A) 2×10-4mole1/2L-1/2S-1                            

(B) 1×10-2S-1

(C) 2×10-4mole-1/2L-1/2S-1                         

(D) 25 mole-1 L min-1                             

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If ‘a’ is the initial concentration of a substance which reacts according to zero order kinetic and k is rate constant, the time for the reaction to go to completion is-

(A) a/k                                                       

(B) 2/ka

(C) k/a                                                       

(D) Infinite

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The following data are obtained from the decomposition of a gaseous compound

Initial pressure, atm               1.6       0.8       0.4

Time for 50% reaction, min     80       113      160

The order of the reaction is

(A) 1.0                                       

(B) 1.5

(C) 2.0                                       

(D) 0.5

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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 is-

(A) 3                                                      

(B) 2

(C) 1                                                      

(D) 0

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The rate constant of a first order reaction is generally determined from a plot of 

(A) Concentration of reactant vs time t

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

(C) 1concentration of reactantvs time t

(D) Concentration of reactant vs log time t

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Which of the following correctly represents the variation of the rate of the reaction with temperature ?

(A)                              

(B) 

(C)                                

(D) 

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The plot of log k versus 1Tis linear with a slope of

(A) EaR                                                    

(B) -EaR

(C) Ea2.303R                                             

(D) -Ea2.303R

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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 70 kJ/mol, the activation energy for the reverse reaction is

(A) 30 kJ/mol                                       

(B) 40kJ/mol

(C) 70 kJ/mol                                       

(D) 100 kJ/mol

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A first order reaction takes 40 min for 30% decomposition.Calculate t1/2   

(A) 77.7 min.                                                  

(B) 27.2 min.

(C) 55.3 min.                                                 

(D) 67.3 min.

Concept Questions :-

First Order Reaction Kinetics
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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 ?

(A) 1                                              

(B) Zero

(C) 2                                              

(D) 3

Concept Questions :-

Order and Molecularity
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