A catalyst:
(i) increases the average kinetic energy of reacting molecules
(ii) decrease the activation energy
(iii) alters the reaction mechanism
(iv) increases the frequency of collisions of reacting species.
The true statements are:

i, i i, i i i

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i, i i i

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i i, i v

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i i, i i i

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Solution

The correct option is D $i i, i i i$
A catalyst is a substance which when added to a reaction, finds an alternative route (hence, altering the reaction mechanism) with lower activation energy as shown in the diagram. Remember that with a catalyst, the average knetic energy of the molecules remains the same but the required energy decreases. So, (i) and (iv) are wrong.
Hence, D is the correct answer.

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Similar questions

Q. 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.

Q. Which of the following factors are responsible for the increase in the rate of a surface catalysed reaction?
I. A catalyst provides proper orientation for the reactant molecules to react
II. 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
IV. Adsorption increases the local concentration of reactant molecules on the surface of the catalyst
Select the correct answer using the codes given below:

Q. The correct statement regarding the functioning of a catalyst is that it:

I \to

alters the energy levels of the reactants and products

I I \to

provides an alternate path for climbing the activation energy barrier

I I I \to

makes the reaction thermodynamically feasible

I V \to

provides a different mechanism for the reaction

Mark the incorrect statements.
(a)Catalyst provides an alternative pathway to reaction mechanism
(b)Catalyst raises the activation energy
(c)Catalyst lowers the activation energy
(d)Catalyst alters enthalpy change of the reaction

Refer to the given graph showing the relationship between temperature and enzyme action.

Select the correct statement regarding 'A' and 'B'.
(i) 'A' shows' rate at which reaction decreases due to denaturation of enzyme molecules.
(ii) 'B' shows the rate at which reaction increases due to decreased kinetic energy of the substrate.
(iii) As temperature rises, more and more enzyme molecules are denatured and 'A' appears to fall.
(iv) 'B' shows the rate at which reaction increases due to an increased kinetic energy of substrate and enzyme molecules.

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A catalyst: (i) increases the average kinetic energy of reacting molecules (ii) decrease the activation energy (iii) alters the reaction mechanism (iv) increases the frequency of collisions of reacting species. The true statements are:

A catalyst:
(i) increases the average kinetic energy of reacting molecules
(ii) decrease the activation energy
(iii) alters the reaction mechanism
(iv) increases the frequency of collisions of reacting species.
The true statements are: