Q18 of 66 Page 47

Which of the following statement is not correct for the catalyst?

The catalyst does not alter the DG (change in Gibbs free energy also called Delta G ()), as the energy of reactant and product remains the same in the presence or absence of a catalyst so, the net change or difference of their energy remains the same.


Thus making option (ii) incorrect.


One can observe from the graph given below that a catalyst catalyzes the forward and the backward reaction to the same extent.


Thus making option (i) correct.


Catalyst provides an alternative path with the lower activation energy for a reaction and does not change the equilibrium constant of a reaction.


Thus making option (iii) and option (iv) correct.


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A first order reaction is 50% completed in 1.26 × 1014 s. How much time would it take for 100% completion?

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Compounds ‘A’ and ‘B’ react according to the following chemical equation.

A (g) + 2 B (g) → 2C (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.



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The value of rate constant of a pseudo first order reaction ____________.

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Consider the reaction A 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?