Chemical kinetics

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Chemical kinetics

Mcq by Anupama Singh

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Which of the following statements is correct?

1 point

The rate of a reaction decreases with passage of time as the concentration of reactants decreases.

The rate of a reaction is same at any time during the reaction.

The rate of a reaction is independent of temperature change.

The rate of a reaction decreases with increase in concentration of reactant(s).

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The value of rate constant of a pseudo first order reaction

1 point

depends on the concentration of reactants present in small amount.

depends on the concentration of reactants present in excess.

is independent of the concentration of reactants.

depends only on temperature.

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The role of a catalyst is to change

1 point

Gibbs energy of reaction

activation energy of reaction

enthalpy of reaction

equilibrium constant

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Activation energy of a chemical reaction can be determined by

1 point

determining the rate constant at standard temperature

determining the rate constant at two temperatures

determining probability of collisions

using catalyst.

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Which of the following statements is incorrect about the collision theory of chemical reaction?

1 point

It considers reacting molecules or atoms to be hard spheres.

Number of effective collisions determines the rate of reaction.

Collision of atoms or molecules possessing sufficient threshold energy results into the product formation.

Molecules should collide with sufficient threshold energy and proper orientation for the collision to be effective

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

1 point

It catalyses the forward and backward reactions to the same extent.

It alters Gibb's energy of the reaction.

It is a substance that does not change the equilibrium constant of a reaction.

It provides an alternate mechanism by reducing activation energy between reactants and products.

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