For a reaction AB, enthalpy of reaction is -4.2 kJmol-1 and enthalpy of activation is 9.6 kJmol-1. The correct potential energy profile for the reaction is:

1. 2.
3. 4.

Subtopic:  Arrhenius Equation |
 70%
From NCERT
NEET - 2021
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The slope of Arrhenius Plot (ln k v/s 1T) of the first-order reaction is -5×103 K. The value of Ea of the reaction is:

[Given R = 8.314 JK-1 mol-1]

1. 166 kJ mol-1 2. -83 kJ mol-1
3. 41.5 kJ mol-1 4. 83.0 kJ mol-1
Subtopic:  Arrhenius Equation |
 71%
From NCERT
NEET - 2021
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The radioisotope, tritium (H13) has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many milligrams of it would remain after 49.2 years:

1. 1 mg 2. 2 mg
3. 4 mg 4. 8 mg
Subtopic:  First Order Reaction Kinetics |
 74%
From NCERT
AIPMT - 2003
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The temperature dependence of the rate constant (k) of a chemical reaction is written in terms of the Arrhenius equation,
k = A.e–E*/RT. The activation energy (E*) of the reaction can be calculated by plotting: 

1. k vs T

2. k vs 1log T

3. log k vs 1T

4. log k vs 1log T

Subtopic:  Arrhenius Equation |
 90%
From NCERT
AIPMT - 2003
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If the rate of the reaction is equal to the rate constant, the order of the reaction is:

1. 0 2. 1
3. 2 4. 3
Subtopic:  Order, Molecularity and Mechanism |
 84%
From NCERT
AIPMT - 2003
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The reaction A → B follows first-order kinetics. The time taken for 0.8 mol of A to produce 0.6 mol of B is 1 hour. The time taken for the conversion of 0.9 mol of A to produce 0.675 mol of B will be: 

1. 1 hour 2. 0.5 hour
3. 0.25 hour 4. 2 hour
Subtopic:  First Order Reaction Kinetics |
 64%
From NCERT
AIPMT - 2003
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The activation energy for a simple chemical reaction A → B is Ea in a forward direction. The activation energy for the reverse reaction:

1. Is negative of Ea

2. Is always less than Ea

3. Can be less than or more than Ea

4. Is always double of Ea

Subtopic:  Arrhenius Equation |
 66%
From NCERT
AIPMT - 2003
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When a biochemical reaction is carried out in a laboratory outside the human body in the absence of an enzyme, then the rate of reaction obtained is 10-6 times. The activation energy of a reaction in the presence of an enzyme is:

1. 6RT
2. P is required.
3. Different from Ea obtained in the laboratory.
4. Data is insufficient.

Subtopic:  Arrhenius Equation |
 71%
From NCERT
AIPMT - 2001
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If at a given instant, for the reaction 2N2O→ 4NO2 + O2 rate and rate constant are 1.02 × 10-4  and 3.4 × 10-5 sec -1 respectively, then the concentration of N2O5 at that time will be: 

1. 1.732 

2. 3.0 

3. 1.02 × 10-4 

4. 3.4 × 105 

Subtopic:  Definition, Rate Constant, Rate Law |
 65%
From NCERT
AIPMT - 2001
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2A  B + C; It would be a zero-order reaction when:

1. The rate of reaction is proportional to the square of the concentration of A
2. The rate of reaction remains the same at any concentration of A
3. The rate remains unchanged at any concentration of B and C
4. The rate of reaction doubles if the concentration of B is doubled
Subtopic:  Order, Molecularity and Mechanism |
 75%
From NCERT
AIPMT - 2002
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