The rate constant for a first order reaction is 4.606×10-3 s-1. The time required to reduce 2.0 g of the reactant to 0.2 g is:

1. 200 s 2. 500 s
3. 1000 s 4. 100 s

Subtopic:  First Order Reaction Kinetics |
 81%
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An increase in the concentration of the reactants of a reaction leads to a change in:

1. heat of reaction

2. threshold energy

3. collision frequency

4. activation energy

Subtopic:  Arrhenius Equation |
 63%
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Consider the plots, given below, for the types of reaction

nAB+C

These plots respectively correspond to the reaction orders:

1. 0, 1, 2

2. 1, 2, 0

3. 1, 0, 2

4. None of these

Subtopic:  Order, Molecularity and Mechanism |
 74%
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For a reaction 12A2B, rate of disappearance of 'A' is related to the rate of appearance of 'B' by the expression:

(1) -d[A]dt=4d[B]dt

(2) -d[A]dt=12d[B]dt

(3) -d[A]dt=14d[B]dt

(4) -d[A]dt=d[B]dt

Subtopic:  Definition, Rate Constant, Rate Law |
 72%
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For a first-order reaction AP, rate constant (k) [dependent on temperature (T)] was found
to follow the equation \(log \ k \ = \ (-2000)\frac{1}{T} \ + \ 6.0\). The pre-exponential factor A and
the activation energy Ea, respectively, are:

1. 1.0×106 s-1 and 9.2 kJ mol-1

2. 6.0 s-1 and 16.6 kJ mol-1

3. 1.0×106 s-1 and 16.6 kJ mol-1

4. 1.0×106 s-1 and 38.3 kJ mol-1

Subtopic:  Arrhenius Equation |
 52%
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Plots showing the variation of the rate constant (K) with temperature (T) are given below. The plot that follows Arrhenius equation is:

1.   

2.  

3.   

4.  

Subtopic:  Arrhenius Equation |
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The time for half-life period of a certain reaction AProducts is 1 hour. When the initial concentration of the reactant 'A', is 2.0 mol L-1, how much time does it take for its concentration to come from 0.50 to 0.25 mol L-1 if it is a zero-order reaction?

1. 1 h

2. 4 h

3. 0.5 h

4. 0.25 h

Subtopic:  Order, Molecularity and Mechanism |
 63%
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The radionuclide T90234h undergoes two successive β-decays followed by one α-decay. the atomic number and the mass number respectively of the resulting radionucleide are:

(1) 92 and 234

(2) 94 and 230

(3) 90 and 230

(4) 92 and 230

Subtopic:  Order, Molecularity and Mechanism |
 69%
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A radioactive element has a half-life of 20 minute. How much time should elapse before the element is reduced to 1/8 its original value?

(1) 40 minute

(2) 60 minute

(3) 80 minute

(4) 160 minute

Subtopic:  First Order Reaction Kinetics |
 84%
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The half-life of 92U238 against \(\alpha\)-decay is 4.5 × 109 year The time taken in a year for the decay of the 15/16 part of this isotope will be:

1. 9.0×109

2. 1.8×1010

3. 4.5×109

4. 2.7×1010

Subtopic:  First Order Reaction Kinetics |
 79%
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