A zero order reaction is one:

1. in which reactants do not react

2. in which one of the reactants is in large excess

3. whose rate does not change with time

4. whose rate increases with time

Subtopic:  Order, Molecularity and Mechanism |
 71%
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For A + B → C + D, H = -20 kJ mol-1 , the activation energy of the forward reaction is 85 kJ mol-1. The activation energy for the backward reaction is…. kJ mol-1.

1. 105 2. 85
3. 40 4. 65
Subtopic:  Arrhenius Equation |
 77%
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Given that K is the rate constant for some order of any reaction at temperature T. Then the value of \(\lim\limits_{T \to \infty} log~k\) = (where A is the Arrhenius constant):
1. \(\frac{\text A}{2.303}\)
2. \(\text A\)
3. \(2.303~\text A\)
4. \(log~\text A\)
Subtopic:  Arrhenius Equation |
 50%
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For the elementary reaction M  N, the rate of disappearance of M increases by a factor of 8 upon doubling the concentration of M. The order of the reaction with respect to M will be:

1. 4

2. 3

3. 2

4. 1

Subtopic:  First Order Reaction Kinetics |
 76%
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The rate constant value for a zero-order reaction is 2 x10-2 mol L-1 sec-1. If the concentration of the reactant after 25 sec is 0.5 M, then the initial concentration of reactant is: 

1. 0.5 M

2. 1.25 M

3. 12.5M

4. 1.0 M

Subtopic:  Order, Molecularity and Mechanism |
 74%
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The rate constant for a second order reaction is 8x10-5 M-1 min-1 . How long will it take a 1M solution to be reduced to 0.5M?

1. 8.665 x 103 minute

2. 8 x 10-5 minute

3. 1.25 x 104 minute

4. 4x10-5 minute

Subtopic:  Order, Molecularity and Mechanism |
 69%
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The activation energy for a reaction is 9.0 kcal/mol. The increase in the rate constant when its temperature is increased from 298K to 308K is:

1. 10%

2. 100%

3. 50%

4. 63%

Subtopic:  Arrhenius Equation |
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For a certain reaction of order \('n'\) the time for half change \(t_{1/2}\) is given by; \(=,t_{1/2}=\dfrac{2-\sqrt2}{K}\times C^{1/2}_0,\) where \(K\) is rate constant and \(C_0\) is initial concentration. The value of \(n\) is:

1. 1

2. 2

3. 0

4. 0.5

Subtopic:  First Order Reaction Kinetics |
 65%
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In the following first order competing reactions:

A + Reagent  Product

B + Reagent  Product

The ratio of K1/K2 if only 50% of B will have been reacted when 94% of A has been reacted in same time is:

1. 4.06

2. 0.246

3. 2.06

4. 0.06

Subtopic:  First Order Reaction Kinetics |
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For a reversible reaction A k2k1 B, Ist order in both the directions, the rate of reaction is given by:

1. K1[A]

2. -K2B

3. K1[A] + K2[B]

4. K1[A] - K2[B]

Subtopic:  First Order Reaction Kinetics |
 55%
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