In the Lindemann-Hinshelwood mechanism for unimolecular gas-phase reactions, the rate-determining step at high pressures is:
The activation of the reactant molecule by collision.
The deactivation of the energized reactant molecule by collision.
The decomposition of the energized reactant molecule.
The formation of the product from the activated complex.
Related Questions
The decomposition of hydrogen peroxide can be slowed by the addition of acetamide. The latter acts as a
Detainer
Stopper
Promoter
Inhibitor
The turnover number (kcat) of an enzyme is defined as:
The substrate concentration at which the reaction velocity is half its maximum.
The maximum number of substrate molecules converted to product per enzyme molecule per unit time.
The dissociation constant of the enzyme-substrate complex.
The equilibrium constant for the overall reaction.
A catalyst alters the rate of a chemical reaction by:
Shifting the equilibrium towards product formation.
Increasing the concentration of reactants.
Changing the activation energy of the reaction.
Altering the enthalpy change of the reaction.
In the formation of by and using NO as catalyst, the catalytic action of is evidenced by :
Green vapours
Violet vapours
Brown vapours
None of these
In the presence of a catalyst, the activation energy of a reaction:
Increases
Remains the same
Decreases
May increase or decrease
A catalyst :
Alter the reaction mechanism
Decreases the activation energy
Increases collision frequency
Increases the average kinetic energy of reacting species
Hydrolysis of maltose by maltase gives :
Glucose
Fructose
Both (a) and (b)
None of these
In homogeneous catalytic reactions, the rate of reaction :
Depends upon the concentration of catalyst
Independent of the concentration of catalyst
Depends upon the free energy change
Depends upon physical state of the catalyst
When a catalyst increases the rate of a chemical reaction, the rate constant :
Increases
Decreases
Remains constant
Becomes infinite
Enzymes are known to increase the rate of reaction by :
times
Β times
times
times
