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17
MCQ (Single Correct Answer)
 

Compounds ' $A$ ' and ' $B$ ' react according to the following chemical equation.

$$\mathrm{A}(\mathrm{~g})+2 \mathrm{~B}(\mathrm{~g}) \longrightarrow 2 \mathrm{C}(\mathrm{~g})$$

Concentration of either ' $A$ ' or ' $B$ ' were changed keeping the concentrations of one of the reactants constant and rates were measured as a function of initial concentration. Following results were obtained. Choose the correct option for the rate equations for this reaction.

Expereiment Initial
concentration of
[A]/mol L$^{-1}$
Initial
concentration of
[B]/mol L$^{-1}$
Initial
concentration of
[C]/mol L$^{-1}$ S$^{-1}$
1. 0.30 0.30 0.10
2. 0.30 0.60 0.40
3. 0.60 0.30 0.20

A
Rate $=k[A]^2[B]$
B
Rate $=k[A][B]^2$
C
Rate $=k[A][B]$
D
Rate $=k[A]^2[B]^0$
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