A zero order reaction is a multi-step reaction

A second order reaction is always a multistep reaction

A first order reaction is always a single step reaction

A zero order reaction is a single step reaction

Under what condition the order of the reaction, 2 H I → H 2 g + I 2 g , is zero

At high partial pressure of H I

At high partial pressure of H 2

At high partial pressure of I 2

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Calculate the age (in years) of the bone where an archaeologist unearths and wants to know the age of the bone. Her chemist friend determines the 45.3% of the initial amount of carbon-14 is present in the bone sample and the half-life of carbon-14 is 5730 yrs .

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Important Questions on Nuclear Chemistry

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Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

The rate constant for the first order reaction is

60 s^{- 1} .

How much time will it take to reduce the concentration of the reactant to

\frac{1}{16} t h

value?

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For a zero - order reaction with rate constant k, the slope of the plot reactant concentration against time is

HARD

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The half-life period of a first-order reaction is

15 minutes

. The amount of substance left after one hour will be

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The rate of a first-order reaction is

0.04 m o l l^{- 1} s^{- 1}

10

second and

0.03 m o l l^{- 1} s^{- 1}

20

seconds after initiation of the reaction. The half-life period of the reaction is:

EASY

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

If 50 % of a reaction occurs in 100 second and 75 % of the reaction occurs in 200 second, the order of this reaction is:

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Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

Decomposition of

H_{2} O_{2}

follows a first order reaction. In fifty minutes the concentration of

H_{2} O_{2}

decreases from

0.5

0.125 M

in one such decomposition. When the concentration of

H_{2} O_{2}

reaches

0.05 M

, the rate of formation of

O_{2}

will be:

EASY

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

A first-order reaction has a specific reaction rate

10^{- 2} \sec^{- 1} .

How much time will it take for

20 g

the reactant to reduce to

5 g

HARD

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

The decomposition reaction $2 N_{2} O_{5} (g) \overset{∆}{\to} 2 N_{2} O_{4} (g) + O_{2} (g)$ is started in a closed cylinder under the isothermal isochoric condition at an initial pressure of $1 atm$ . After $\frac{Y}{10} \times 10^{3} s$ , the pressure inside the cylinder is found to be $1.45 a t m$ . If the rate constant of the reaction is $5 \times 10^{- 4} s^{- 1}$ , assuming ideal gas behaviour, the value of $Y$ is(nearest integer)

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Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

It takes

1 h

for a first order reaction to go to

50 %

completion. The total time required for the same reaction to reach

87.5 %

completion will be

EASY

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

The rate constant for a first order reaction is

7 .0 \times 10^{- 4} s^{- 1} .

If initial concentration of the reactant is

0.080 M

, what is the half-life of the reaction?

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Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

During the nuclear explosion, one of the products is

^{90} S r

with half life of

6.93

years. If

1 μ g

^{90} S r

was absorbed in the bones of a newly born baby in place of

C a,

how much time, in years, is required to reduce it by

90 %

if it is not lost metabolically ____________.

HARD

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

The reaction

2 N_{2} O_{5} (g) \to 4 N O_{2} (g) + O_{2} (g)

follows first order kinetics. The pressure of a vessel containing only

N_{2} O_{5}

was found to increase from 50 mm Hg to 87.5 mm Hg in 30 min. The pressure exerted by the gases after 60 min. Will be (Assume temperature remains constant) :

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Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

The given plots represent the variation of the concentration of a reactant $R$ with time for two different reactions $(i) and (ii)$ . The respective orders of the reaction are
(i) Question Image