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 |
71%
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. $1×{10}^{-7}$ $;$ $1×{10}^{6}$

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. $\frac{1}{4}$

2. $\frac{1}{8}$

3. $\frac{1}{16}$

4. $\frac{1}{32}$

Subtopic:  First Order Reaction Kinetics |
75%
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. $\frac{d\left[B{r}^{-}\right]}{dt}=-\frac{3}{5}\frac{d\left[B{r}_{2}\right]}{dt}$

2. $\frac{d\left[B{r}^{-}\right]}{dt}=\frac{3}{5}\frac{d\left[B{r}_{2}\right]}{dt}$

3. $\frac{d\left[B{r}^{-}\right]}{dt}=-\frac{5}{3}\frac{d\left[B{r}_{2}\right]}{dt}$

4. $\frac{d\left[B{r}^{-}\right]}{dt}=\frac{5}{3}\frac{d\left[B{r}_{2}\right]}{dt}$

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 ${\mathrm{N}}_{2}{\mathrm{O}}_{5}$ at that time will be:

1. 1.732

2. 3.0

3. $1.02$ $×$ ${10}^{-4}$

4. $3.4$ $×$ ${10}^{5}$

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. $\frac{6}{RT}$
2. P is required.
3. Different from ${E}_{a}$ obtained in the laboratory.
4. Data is insufficient.

Subtopic:  Arrhenius Equation |
72%
From NCERT
AIPMT - 2001
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The half-life period of ${C}^{14}$ is:
1.  500 years
2.  5000 years
3.  50 years
4.  5 × ${10}^{4}$ years

Subtopic:  Definition, Rate Constant, Rate Law |
55%
AIPMT - 2001
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