18
MCQ (Single Correct Answer)
Which of the following statement is not correct for the catalyst?
A
It catalyses the forward and backward reactions to the same extent
B
It alters $\Delta G$ of the reaction
C
It is a substance that does not change the equilibrium constant of a reaction
D
It provides an alternate mechanism by reducing activation energy between reactants and products
19
MCQ (Multiple Correct Answer)
The value of rate constant of a pseudo first order reaction ............ .
A
depends on the concentration of reactants present in small amount
B
depends on the concentration of reactants present in excess
C
is independent of the concentration of reactants
D
depends only on temperature
20
MCQ (Single Correct Answer)
Consider the reaction $\mathrm{A} \longrightarrow \mathrm{B}$. The concentration of both the reactants and the products varies exponentially with time. Which of the following figures correctly describes the change in concentration of reactants and products with time?
A
B
C
D
21
MCQ (Multiple Correct Answer)
Rate law cannot be determined from balanced chemical equation if ............... .
A
reverse reaction is involved
B
it is an elementary reaction
C
it is a sequence of elementary reactions
D
any of the reactants is in excess
22
MCQ (Multiple Correct Answer)
Which of the following statements are applicable to a balanced chemical equation of an elementary reaction?
A
Order is same as molecularity
B
Order is less than the molecularity
C
Order is greater than the molecularity
D
Molecularity can never be zero