Chemical Kinetics Test

Result

Chemical Kinetics Test - 70

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Question 1
1 / -0

What will be the initial rate of a reaction if its rate constant is $${10}^{-3}{min}^{-1}$$ and the concentration of reactant is $$0.2\ mol .{dm}^{-1}$$. Also, the amount of reactant converted into products in 200 minutes is:

A
$$2\times{10}^{-4} mol. {dm}^{-3}{min}^{-1}$$, $$81.97\%$$

B
$$2\times{10}^{-4} mol. {dm}^{-3}{min}^{-1}$$, $$18.03\%$$

C
$$2\times{10}^{-4} mol. {dm}^{-3}{min}^{-1}$$, $$76\%$$

D
$$2\times{10}^{-4} mol. {dm}^{-3}{min}^{-1}$$, $$24\%$$

Solution
Question 2
1 / -0

For a first order reaction velocity constant, $$k=10^{-3}s^{-1}$$. Two third life for it would be

A
1100 s

B
2200 s

C
3300 s

D
4400 s

Solution
Question 3
1 / -0

Consider the data below for a reaction $$A\rightarrow B$$

Time
(sec) 0 10 20 30
Rate $$1.60\times 10^{-2}$$
$$1.60\times 10^{-2}$$
$$1.60\times 10^{-2}$$ $$1.59\times 10^{-2}$$

from the above data the order of reaction is:

A
Zero

B
1

C
2

D
3
Question 4
1 / -0

If a reaction $$A + B \rightarrow C$$ is exothermic to the extent of $$30 kJ mol^{-1}$$ and the forward reaction has an activation energy, $$X\ kJ mol^{-1}$$ the activation energy for the reverse reaction is :

A
$$30 \ kJ mol^{-1}$$

B
$$X - 30 kJ mol^{-1}$$

C
$$X \ kJ mol^{-1}$$

D
$$X + 30 \ kJ mol^{-1}$$

Solution
Question 5
1 / -0

Heptene decomposses according to following reaction
$$C_{7}H_{14}\overset{\Delta }{\rightarrow}2C_{2}H_{4}+C_{3}H_{6}$$
Rate constant was found to be $$1\times 10^{-4}sec^{-1}$$. In what time molar ration of heptene to ethene in the reaction mixture will attain the value 1?
[log 2 = 0.3010, log 3=0.4771]

A
68 min

B
4055 min

C
1736 min

D
228 min

Solution
Question 6
1 / -0

Decomposition of nitrogen pentoxide is known to be a first order reaction 75 percent of the oxide had decomposed in the first 24 minutes. At the end of an hour, after the start of the reaction, the amount of oxide left will be

A
Nill

B
About 1%

C
About 2%

D
About 3%

Solution
Question 7
1 / -0

If the half-life of a first-order reaction is 100 seconds then the time required for completion of 90 % of the reaction is ;

A
693 sec

B
90 sec

C
332 sec

D
10 sec

Solution
Question 8
1 / -0

The rate of the first-order reaction is 0.04 mol/L/s at 10 s and 0.03 mol/L/s at 20 s after initiation of the reaction, the half life period of reaction is:

A
44.1 s

B
54.1 s

C
24.1 s

D
34.1 s
Question 9
1 / -0

$$75\%$$ of a first-order reaction is completed in 30 minutes. What is the time required for $$93.75\%$$ of the reaction (in minutes) ?

A
$$45$$

B
$$120$$

C
$$90$$

D
$$60$$
Question 10
1 / -0

When the initial concentration of the reactant doubled, the half-life period of the reaction is also doubled. Hence the order of the reaction is

A
one

B
two

C
fraction

D
zero