A first order reaction complete 40% in 20 minutes. In how much time it is completed 90% of its original amount?

1. 45 min

2. 60 min 

3. 75 min

4. 90 min

Subtopic:  First Order Reaction Kinetics |
 52%
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The dissociation of H2O2 is a first order reaction. The half life for '16 V H2O2 is 30 min, calculate the time at which the solution is 1V H2O2 ?

(1) 120 min.

(2) 90 min.

(3) 60 min.

(4) 150 min.

Subtopic:  Definition, Rate Constant, Rate Law |
 73%
From NCERT
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If the activation energy is 65 kJ then the reaction at 25°C is .......times fast as compared to 0°C :-

1. 2 times

2. 5 times

3. 11 times

4. 16 times

Subtopic:  Arrhenius Equation |
 58%
From NCERT
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When temperature is increased from 27°C to 127°C, rate of reaction becomes doubled, then Ea will be?

1. 1.66 kcal.

2. 3.32 kcal.

3. 5.33 kcal.

4. 6.64 kcal.

Subtopic:  Arrhenius Equation |
 58%
From NCERT
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If 2M, 1L solution of acetic acid is added to 3M, 1L ethyl alcohol then the following elementary reaction takes place.

CH3COOH + C2H5OH  CH3COOC2H5 + H20

If each solution is diluted by 1 litre then the initial rate becomes how many times:-

(1) 4

(2) 2

(3) 0.5

(4) 0.25

Subtopic:  Definition, Rate Constant, Rate Law |
From NCERT
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For a certain reaction, 10% of the reactant dissociates in 1 hour, 20% of the reactant dissociates in 2 hours, 30% of the reactant dissociates in 3 hours. Then the units of the rate constant is:-

(1) hour-1

(2) mol L-1 hr-1

(3) mol L-1 sec-1

(4) mol L sec-1

Subtopic:  Order, Molecularity and Mechanism |
 58%
From NCERT
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For a first order reaction A  product :

(1)

 

(2)

 

(3)

 

(4) 

Subtopic:  Order, Molecularity and Mechanism |
From NCERT
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Two reactions of the same order have equal Pre-exponential factors but their activation energies differ by 24.9 kJ/mol. Calculate the ratio between the rate constants (K1/K2) these reactions at 27°C :

1. 2.2 × 104

2. 1/2 × 10-4

3. 1/2 × 104

4. 2.2 × 10-4

Subtopic:  First Order Reaction Kinetics |
 53%
From NCERT
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The activation energy of a reaction is zero. The rate constant of the reaction is :

1. increases with an increase in temperature

2. decreases with a decrease in temperature

3. decreases with an increase in temperature

4. is nearly independent of temperature

Subtopic:  Arrhenius Equation |
 75%
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The rate constant of a first order reaction is 10-3 min-1 at 27°C. The temperature coefficient of this  reaction is 2. The rate constant at 17°C will be :

(1) 10-3 min-1

(2) 5  x 10-4 min-1

(3) 2 x 10-3 min-1

(4) 10-2 min-1

Subtopic:  Arrhenius Equation |
 64%
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