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Class 12 Chemistry
Chemical Kinetics
Quiz 1
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In chemical equation H (g) + I (g) \(\rightleftharpoons\) 2HI (g) the equilibrium constant K depends on
0%
total pressure
0%
catalyst used
0%
amount of H and I
0%
temperature
Explanation
catalyst used
If the rate of a reaction is expressed by, rate = A [A]² [B], the order of reaction will be
0%
2
0%
3
0%
1
0%
0
Explanation
3
How long time will 5 g of this reactant take to reduce to 3 g?
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444 s
0%
400 s
0%
528 s
0%
669 s
Explanation
444 s
A reaction in which reactants (R) are converted into products (P) follows second order kinetics. If concentration of R is increased by four times, what will be the increase in the rate of formation of P?
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9 times
0%
4 times
0%
16 times
0%
8 times
Explanation
16 times
For a reaction nx – y → z the rate of reaction becomes twenty seven times when the concentration of X is increased three times. What is the order of the reaction?
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2
0%
1
0%
3
0%
0
Explanation
3
The rate constant of a reaction depends upon
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temperature of the reaction
0%
extent of the reaction
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initial concentration of the reactants
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the time of completion of reaction
Explanation
the time of completion of reaction
The unit of rate and rate constant are same fora
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zero order reaction
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first order reaction
0%
second order reaction
0%
third order reaction
Explanation
zero order reaction
The number of molecules of the reactants taking part in a single step of the reaction is indicative of
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order of a reaction
0%
molecuiarity of a reaction
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fast step of the mechanism of a reaction
0%
half-life of the reaction
Explanation
molecuiarity of a reaction
Fora unimolecular reaction
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the order and molecuiarity of the slowest step are equal to one
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molecuiarity of the reaction can be zero, one or two
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molecuiarity of the reaction can be determined only experimentally
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more than one reacting species are involved in one step
Explanation
the order and molecuiarity of the slowest step are equal to one
The overall rate of a reaction is governed by
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the rate of fastest intermediate’step
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the sum total of the rates of all intermediate steps
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the average of the rates of all the intermediate steps
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the rate of slowest intermediate step
Explanation
the rate of slowest intermediate step
The order of reaction is decided by
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temperature
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mechanism of reaction as well as relative concentration of reactants
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molecularity
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pressure
Explanation
mechanism of reaction as well as relative concentration of reactants
Rate constant in case of first order reaction is
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inversely proportional to the concentration units
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independent of concentration units
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directly proportional to concentration units
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inversely proportional to the square of concentration units
Explanation
independent of concentration units
Half life period of a first order reaction is 10 min. What percentage of the reaction will be completed in 100 min?
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25%
0%
50%
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99.9%
0%
75%
Explanation
99.9%
In pseudo unimolecular reactions
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both the reactants are present in low concentration
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both the reactants are present in same concentration
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one of the reactant is present in excess
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one of the reactant is non-reactive
Explanation
one of the reactant is present in excess
A first order reaction takes 40 min for 30% decomposition. What will be t
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77.7 min
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52.5 min
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46.2 min
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22.7 min
Explanation
77.7 min
Radioactive disintegration is an example of
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zero order reaction
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first order reaction
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second order reaction
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third order reaction
Explanation
first order reaction
A plot of log (a – x) against time t is a straight line. This indicates that the reaction is of
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zero order
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first order
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second order
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third order
Explanation
first order
Rate of which reaction increases with temperature?
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Exothermic reaction
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Endothermic reaction
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(a) and (b) both
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None of the above
Explanation
(a) and (b) both
The activation energy in a chemical reaction is defined as
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the difference in energies of reactants and products
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the sum of energies of reactants and products
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the difference in energy of intermediate complex with the average energy of reactants and products
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the difference in energy of intermediate complex and the average energy of reactants
Explanation
the difference in energy of intermediate complex and the average energy of reactants
In a reaction, 2X → Y, the concentration of X decreases from 0.50 M to 0.38 M in 10 min. What is the rate of reaction in Ms
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2 × 10
0%
4 × 10
0%
1 × 10
0%
3 × 10
Explanation
2 × 10
0 h : 0 m : 1 s
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