Free download in PDF Chemical Reaction Engineering Objective Type Questions & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
21
Select the correct statement
A
Reactions with high activation energies are very temperature sensitive
B
Reactions with high activation energies are relatively temperature insensitive
C
Reactions with low activation energies are very temperature sensitive
D
A given reaction is much more temperature insensitive at low temperature than at high temperature.
23
What experimental information is necessary to determine the energy of activation for a chemical reaction? (k0 is an unknown constant in the Arrhenius equation)
A
The reaction rate constant at one temperature is sufficient
B
The reaction rate constants at two or more different temperatures must be known
C
The reaction rate constants at three different temperatures must be known
D
The reaction rate constants at two different temperatures and k0 must be known.
Answer: The reaction rate constants at two or more different temperatures must be known
24
Suppose doubling the concentration of a reactant increases the rate of reaction by a facator of 4, and tripling the concentration of the reactant increases the reaction rate by a factor of 9. Then the rate of reaction is proportional to the concentration of the reactant raised to the
26
A reaction follows the rate expression rate = k CA If the rate is expressed in terms of mole/(1 sec) and the concentration of A (CA) is in mole/lit, the units of the first-order rate constant (k) are
27
For the chemical reaction A ? B, it is found that the rate of the reaction triples when concentration of A is increased 9 times. If rate ? CAn, what must n be for this reaction?
28
For the chemical reaction A ? B, it is found that the rate of the reaction increases by a factor of 8 when the concentration of A is doubled. If rate ? CAn, what must n be for this reaction?
29
For the chemical rection A ? B, it is found that the rate of the reaction quadruples when the concentration of A is doubled. If rate ? CAn, what must n be?
30
For the chemical rection A ? B, it is found that the rate of the reaction doubles as the concentration of A is doubled. If rate ? CAn, what must n be for this reaction?
32
Liquid A decomposes by irreversible first-order kinetics and the half-life period of this reaction is 12 min. The time required for 75% conversion of A is
40
If the time required to change the concentration of reactant to half its original value is independent of the initial concentration the order of reaction is
