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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The time for half-life of a first order reaction is 1 hr. What is the time taken for 87.5% completion of the reaction?

1. 1 hour

2. 2 hour

3. 3 hour

4. 4 hour

Subtopic:  First Order Reaction Kinetics |
 76%
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Which order of reaction obeys the relation t1/2 = 1/Ka?

1. First

2. Second

3. Third

4. Zero

Subtopic:  Order, Molecularity and Mechanism |
 67%
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The chemical reaction, 2O3 3O2 proceeds as follows;

O3 O2 + O .....(Fast)

O+O3  2O2 ....(Slow)

The rate law expression should be:

1. r = K[O3]2

2. r = K[O3]2[O2]-1

3. r = K[O3][O2]

4. unpredictable

Subtopic:  Definition, Rate Constant, Rate Law |
 69%
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The rate of reaction becomes 2 times for every 10°C rise in temperature. How the rate of reaction will increase when temperature is increased from 30°C to 80°C?

1. 16

2. 32

3. 64

4. 128

Subtopic:  Definition, Rate Constant, Rate Law |
 81%
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The rate constant (K) for the reaction 2A +B  Product was found to be 2.5x10-5 litre mol-1 sec-1 after 15 sec, 2.60 x10-5 litre mol-1sec-1 after 30 sec and 2.55 x10-5litre mol-1 sec-1 after 50 sec. The order of reaction is:

1. 2

2. 3

3. zero

4. 1

Subtopic:  First Order Reaction Kinetics |
 55%
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A reaction A2 + B2  2AB occurs by the following mechanism:

A2  A + A               .....(slow)

A + B2  AB + B       .....(fast)

A + B  AB               .....(fast)

Its order would be:

1. 3/2

2. 1

3. 0

4. 2

Subtopic:  Order, Molecularity and Mechanism |
 63%
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For a given reaction, the presence of a catalyst reduces the energy of activation by 2 kcal at 27 oC. The rate of reaction will be increased by:

1. 20 times

2. 14 times

3. 28 times

4. 2 times

Subtopic:  Arrhenius Equation |
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