A first order reaction has a specific reaction rate of 10-2s-1. How much time will it take for 20 g of the reactant to reduce to 5 g?

(a) 238.6 s      (b) 138.6 s        (c) 346.5  s        (d) 693.0 s

Subtopic:  First Order Reaction Kinetics |
 81%
From NCERT
NEET - 2017
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The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the

(1) rate is proportional to the surface coverage

(2) rate is inversely proportional to the surface coverage

(3) rate is independent of the surface coverage

(4) rate of decomposition is very slow

Subtopic:  First Order Reaction Kinetics |
 54%
NEET - 2016
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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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