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Practice each question, then open the answer or worked solution.
In any unimolecular reaction ______________.
(i) only one reacting species is involved in the rate-determining step.
(ii) the order and the molecularity of the slowest step are equal to one.
(iii) the molecularity of the reaction is one and order is zero.
(iv) both molecularity and order of the reaction are one.
Option (i) and (ii) is the answer.
For a complex reaction ______________.
(i) order of an overall reaction is the same as molecularity of the slowest step.
(ii) order of an overall reaction is less than the molecularity of the slowest
step.
(iii) order of an overall reaction is greater than molecularity of the slowest step.
(iv) the molecularity of the slowest step is never zero or non-integer.
Option (i) and (iv) are the answers.
At high pressure, the following reaction is zero order.
2NH3(g) →1130 K Platinum catalyst N2(g) + 3H2(g)
Which of the following options are correct for this reaction?
(i) Rate of reaction = Rate constant
(ii) Rate of the reaction depends on the concentration of ammonia.
(iii) Rate of decomposition of ammonia will remain constant until ammonia
disappears completely.
(iv) Further increase in pressure will change the rate of reaction.
Option (i), (iii) and (iv) are the answers.
During decomposition of an activated complex
(i) energy is always released
(ii) energy is always absorbed
(iii) energy does not change
(iv) reactants may be formed
Option (i) and (iv) are the answers.
According to Maxwell Boltzmann distribution of energy, __________.
(i) the fraction of molecules with most probable kinetic energy decreases
at higher temperatures.
(ii) the fraction of molecules with most probable kinetic energy increases
at higher temperatures.
(iii) most probable kinetic energy increases at higher temperatures.
(iv) most probable kinetic energy decreases at higher temperatures.
Option (i) and (iii) are the answers.
In the graph showing Maxwell Boltzman distribution of energy, ___________.
(i) the area under the curve must not change with an increase in temperature.
(ii) the area under the curve increases with increase in temperature.
(iii) the area under the curve decreases with increase in temperature.
(iv) with the increase in the temperature, curve broadens and shifts to the right-hand side.
Option (i) and (iv) are the answers.
Which of the following statements are in accordance with the Arrhenius
equation?
Option (i) and (ii) are the answers.
Solution coming soon.
Mark the incorrect statements.
Option (ii) and (iv) are the answers.
Which of the following graphs is correct for a zero-order reaction?
Option (ii) and (iv) are the answers.
Which of the following graphs is correct for a first-order reaction?
Option (i) and (iv) are the answers.
III. Short Answer Type