Identify the true statement(s):
A catalyst participates in the reaction. It may be consumed during the reaction but it is regenerated at the end of the reaction. Hence, a catalyst is chemically unchanged at the end of a reaction.
A catalyst may take part in the rate determining step. hence, it may appear in the kinetic rate equation of the reaction.
A catalyst will only increase the rate at which equilibrium is established. It will not affect the composition of an equilibrium mixture.
A catalyst only affects the rates of forward and reverse reaction. It cannot cause a non-spontaneous ( G > 0) reaction to proceed.
Consider the following reactions at 300 K: X $$\rightarrow$$ Y (uncatalysed reaction) & X $$\rightarrow$$ Y (catalysed reaction). The energy of activation is lowered by 83.14 kJmol$$^{-1}$$ for the catalysed reaction. The rate of catalysed reaction is:
The half-life of a substance in a certain enzyme catalysed reaction is 138 s. The time required for the concentration of the substance to fall from $$1.28 mg L^{-1}$$ to $$0.04 mg L^{-1}$$ is:
For a given reaction, energy of activation for forward reaction $$(E_{af})$$ is $$80kJ.mol^{-1}.$$ $$\Delta H = -40kJ.mol^{-1}$$ for the reaction. A catalyst lowers $$E_{af}$$ to $$20 kJ.mol^{-1}.$$ The ratio of energy of activation for reverse reaction before and after addition of catalyst is :
The role of a catalyst is to change _______.
Which of the following statements about the catalyst is true?
Which of the following factors are responsible for the increase in the rate of a surface catalyzed reaction? (i) A catalyst provides proper orientation for the reactant molecules to react. (ii) The heat of adsorption of reactants on a catalyst helps reactant molecules to overcome activation energy. (iii) The catalyst increases the activation energy of the reaction.
What is the role of desorption in the process of catalysts?
How does a catalyst work?
Give reasons for the following: Rough surface of catalyst is more effective than smooth surface.
A catalyst is a substance which