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Standard XII

Chemistry

Collision Theory

A catalyst in...

Question

A catalyst increases the rate of a reaction by:

increasing the activation energy of the reaction

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increasing the value of rate constants

(k_{f}

and

k_{b})

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increasing the enthalpy change of the reaction

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decreasing the enthalpy change of the reaction

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Solution

The correct option is C increasing the enthalpy change of the reaction
A catalyst increases rate of reacting by decreasing activation energy. and increasing the enthalpy change of the reaction

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Similar questions

The role of a catalyst is to change ...... .
(a) Gibbs energy of reaction
(b) enthalpy of reaction
(c) activation energy of reaction
(d) equilibrium constant

Q. A reaction takes place at

300 K

. When the catalyst is added rate of reaction increases. Calculate the change in temperature

(

^{o} C)

which would have the same effect on the rate of reaction as that of catalyst. (Assume catalyst change the activation energy by

20 %

)

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

Q. Assertion :A catalyst increases the rate of reaction without itself undergoing any permanent chemical change. Reason: A catalyst changes the Gibbs energy

(△ G)

of the reaction and equilibrium constant of the reaction.

Q. A reaction takes place at 300 K. When the catalyst is added, the rate of reaction increases. The change in temperature

(i n^{\circ} C)

which can create the same effect as produced by catalyst (experimentally it is known that catalyst change the activation energy by

20 %

) is

x

, then find the value of

\frac{x + 6}{9}

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A catalyst increases the rate of a reaction by:

The correct option is C increasing the enthalpy change of the reactionA catalyst increases rate of reacting by decreasing activation energy. and increasing the enthalpy change of the reaction

The correct option is C increasing the enthalpy change of the reaction
A catalyst increases rate of reacting by decreasing activation energy. and increasing the enthalpy change of the reaction