Chemical Kinetics Test

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Chemical Kinetics Test - 71

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Question 1
1 / -0

A reaction $$P \rightarrow Q$$ is $$25\%$$ complete in $$25 min,$$ $$50\%$$ complete in $$25 min$$ if $$[ P ]$$ is halved. The reaction is $$25 \%$$ completed in $$50 min$$ if $$[ P ]$$ is doubled. The order of reaction is

A
$$1$$

B
$$2$$

C
$$0$$

D
$$3$$

Solution
Question 2
1 / -0

Reaction $$A\rightarrow B$$ follows second order kinetics. Doubling the concentration of A will increase the rate of formation of B by a factor of:

A
$$1/4$$

B
$$1/2$$

C
$$2$$

D
$$4$$
Question 3
1 / -0

Consider the following first order competing reaction :
$$X\xrightarrow{{{K_1}}}A + B$$ and $$Y\xrightarrow{{{K_2}}}C + D$$
if $$50\% $$ of the reaction of $$X$$ was completed when $$96\% $$ of the reaction of $$Y$$ was completed , the ratio of their rate constant $$\left( {{K_2}/{K_1}} \right)$$ is:

A
$$4.06$$

B
$$0.215$$

C
$$1.1$$

D
$$4.65$$

Solution
Question 4
1 / -0

For a first-order reaction, the plot of 't' against $$log \ C$$ gives a straight line with a slope equal to:

A
$$-\cfrac {k}{2.303}$$

B
$$-\cfrac { 2.303 }{ k } $$

C
$$ln (\cfrac {k}{2.303})$$

D
$$-k$$
Question 5
1 / -0

The initial concentration of $$N_2O_5$$ in the following first order reaction $$N_2O_{5(g)} \rightarrow 2NO_2(g) + \dfrac{1}{2} O_2 (g)$$ was $$1.24 \times 10^{-2} \ molL^{-1}$$ at 318 K. The concentration of $$N_2O_5$$ after 60 min was $$0.20 \times 10^{-2} \ molL^{-1}$$. Calculate the rate constant of the reaction at 318 K.

A
$$0.0104 min^{-1}$$

B
$$0.0204 min^{-1}$$

C
$$0.0304 min^{-1}$$

D
$$0.0404 min^{-1}$$

Solution
Question 6
1 / -0

The curves $$M$$ and $$N$$ represent the variation of energy with reaction coordinates for the reaction $$A(g)+B(g) \rightleftharpoons C(g)+D(g)$$ in absence and presence of negative catalyst
Of the curves $$M$$ and $$N$$, which represents the $$E_{a}$$ for the backward reaction in the presence of catalyst

A
$$P$$

B
$$Q$$

C
$$S+P$$

D
$$P+Q$$
Question 7
1 / -0

For a zero order reaction:

A
$${ t }_{ \frac { 1 }{ 2 } }\propto a$$

B
$${ t }_{ \frac { 1 }{ 2 } }\propto \cfrac { 1 }{ a } $$

C
$${ t }_{ \frac { 1 }{ 2 } }\propto { a }^{ 2 }$$

D
$${ t }_{ \frac { 1 }{ 2 } }\propto \cfrac { 1 }{ { a }^{ 2 } } $$

Solution
Question 8
1 / -0

A graph of $$log_{10}k$$ is plotted against $$1/T$$ for a reaction with order 2.5. If the activation energy is 10 kJ/mol, then magnitude of the slope will be:

A
$$4.34\times 10^3$$

B
$$5.2\times 10^2$$

C
$$1.2\times 10^4$$

D
$$6.8\times 10^{-3}$$
Question 9
1 / -0

In a first order reaction, $$0.16$$ moles of reactant decrease to $$0.02$$ moles in $$144$$ minutes, its half life is ?

A
$$24$$

B
$$12$$

C
$$72$$

D
$$48$$

Solution
Question 10
1 / -0

The time required for 75% completion of a first reaction is 9 hr. The half-life period of the reaction is:

A
18 hr

B
9 hr

C
6 hr

D
4.5 hr