By which can activation energy be calculated?
1.  At a constant temperature
2.  At two different temperature
3.  For reversible reaction
4.  For volatile reaction

Subtopic:  Arrhenius Equation |
 70%
AIPMT - 1998
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If the concentration of a solution is changed from 0.2 to 0.4, then what will be rate and rate constant. The reaction is of first order and rate constant is K=1×10-6

1. 2×10-7 ; 1×10-6

2. 1×10-7 ; 1×106

3. 4×10-7 ; 1×10-6

4. 2×10-3 ; 1×10-3

Subtopic:  First Order Reaction Kinetics |
From NCERT
AIPMT - 1999
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Half-life of a radioactive sample is 4 days. After 16 days what quantity of matter remains undecayed?

1. 14

2. 18

3. 116

4. 132

Subtopic:  First Order Reaction Kinetics |
 74%
From NCERT
AIPMT - 1999
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If the bombardment of α-particle on \(N_{7}^{14}\)  emits protons, then new atom will be:
1. \(O_{8}^{17}\)

2. \(O_{8}^{16}\)

3. \(C_{6}^{14}\)

4. Ne

Subtopic:  First Order Reaction Kinetics |
From NCERT
AIPMT - 1999
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If the half-life of a substance is 77 days then it's decay constant (days-1) will be:

1. 0.9 2. 0.09
3. 0.009 4. 0.013
Subtopic:  First Order Reaction Kinetics |
 70%
From NCERT
AIPMT - 1999
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A 300-gram radioactive sample has a half-life of 3 hours. After 18 hours the remaining quantity will be:

1. 4.68 gram

2. 2.34 gram

3. 3.34 gram

4. 9.37 gram

Subtopic:  First Order Reaction Kinetics |
 73%
From NCERT
AIPMT - 2000
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For the reaction, \(H^{+}+BrO^-_3+3Br^- \rightarrow~5Br_2+H_2O\) the correct representation of the consumption & formation of reactants and products is:
 

1. d[Br-]dt=-35d[Br2]dt

2. d[Br-]dt=35d[Br2]dt

3. d[Br-]dt=-53d[Br2]dt

4. d[Br-]dt=53d[Br2]dt

Subtopic:  Definition, Rate Constant, Rate Law |
 74%
From NCERT
AIPMT - 2000
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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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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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The half-life period of C14 is:
1.  500 years
2.  5000 years
3.  50 years
4.  5 × 104 years

Subtopic:  Definition, Rate Constant, Rate Law |
 54%
AIPMT - 2001
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