The rate of a first-order reaction is 0.04 mol L-1 s-1 at 10 sec and 0.03 mol L-1 s-1 at 20 sec after initiation of the reaction. The half-life period of the reaction is

1. 34.1 s

2. 44.1 s

3. 54.1 s

4. 24.7 s

Subtopic:  First Order Reaction Kinetics |
From NCERT
NEET - 2016
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The activation energy of a reaction can be determined from the slope of the graph between : 

1. ln K vs T

2. ln KT vs T

3. ln K vs 1T

4. Tln K vs 1T

Subtopic:  Arrhenius Equation |
 87%
From NCERT
NEET - 2015
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If the half-life is independent of its initial concentration, then the order of the reaction is:

1. 0 

2. 1

3. 3

4. 2

Subtopic:  Order, Molecularity and Mechanism |
 85%
From NCERT
NEET - 2015
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The rate constant of the reaction A  B is 0.6 x 10-3 molar per second. If the

concentration of A is 5 M then concentration of B after 20 min is

1. 1.08 M

2. 3.60 M

3. 0.36 M

4. 0.72 M

Subtopic:  Order, Molecularity and Mechanism |
 55%
From NCERT
NEET - 2015
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If the rate of reaction doubles when the temperature is raised from 20 °C to 35 °C, then the activation energy for the reaction will be :
(R = 8.314 J mol-1 K-1)

1. 342 kJ mol-1

2. 269 kJ mol-1

3. 34.7 kJ mol-1

4. 15.1 kJ mol-1

Subtopic:  First Order Reaction Kinetics |
 63%
From NCERT
NEET - 2013
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A reaction having equal energies of activation for forward and reverse reactions has

1. S = 0

2. G = 0

3. H = 0

4. H = G = S = 0

Subtopic:  Arrhenius Equation |
 67%
NEET - 2013
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For the reaction,

N2O5(g) → 2NO2(g) + \(\frac{1}{2}\)O2(g)

the value of the rate of disappearance of N2O5 is given as 6.25 × 10-3 mol L-1s-1. The rate of formation of NO2 and O2 is given respectively as:

1. 6.25 x 10-3 mol L-1s-1 and 6.25 x 10-3 mol L-1s-1

2. 1.25 x 10-2 mol L-1s-1 and 3.125 x 10-3 mol L-1s-1

3. 6.25 x 10-3 mol L-1s-1 and 3.125 x 10-3 mol L-1s-1

4. 1.25 x 10-2 mol L-1s-1 and 6.25 x 10-3 mol L-1s-1

Subtopic:  Definition, Rate Constant, Rate Law |
 86%
From NCERT
NEET - 2010
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For an endothermic reaction, energy of activation is Ea and enthalpy of reaction is H (both of these in kJ/mol). Minimum value of Ea will be

1. Less than H

2. Equal to H

3. More than H

4. Equal to zero

Subtopic:  Arrhenius Equation |
 67%
NEET - 2010
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Half-life period of a first order reaction is 1386s. The specific rate constant of the reaction

is

1. 5.0 x 10-3s-1

2. 0.5 x 10-2s-1

3. 0.5 x 10-3s-1

4. 5.0 x 10-2s-1

Subtopic:  Definition, Rate Constant, Rate Law |
 81%
From NCERT
NEET - 2009
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For the reaction A+B products, it is observed that
 

(1) On doubling the initial concentration of A only, the rate of reaction is also doubled and
(2) On doubling the initial concentrations of both A and B, there is a change by a factor of 8 in that rate of the reaction

The rate of this reaction is, given by

1. rate = k[A]2[B]

2. rate = k[A][B]2

3. rate = k[A]2[B]2

4. rate = k[A][B]

Subtopic:  Order, Molecularity and Mechanism |
 83%
From NCERT
NEET - 2009
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