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Standard X

Chemistry

Ionic Salts and Their Characteristic

What is the r...

Question

What is the role of a catalyst in a reaction ?

Lowers the activation energy

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Increase the activation energy

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Affects the free energy change

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Affects the enthalpy change

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Solution

The correct option is A Lowers the activation energy
All substances have average energy and before the reaction occurs energy of the reactant should be higher than the average energy. The catalyst lowers the activation clergy. Therefore, rate of reaction is increased.

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Similar questions

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

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 is given, which energy of activation for forward reaction is

(E_{a f})

80 k J m o l^{- 1}

.Enthalpy change is

Δ H = - 40 k J m o l^{- 1}

for the reaction. A catalyst lowers

E_{a f}

20 k J

m o l^{- 1}

.What will be the ratio of energy of activation for reverse reaction before and after addition of catalyst:

Q. For a given reaction, energy of activation for forward reaction

(E_{a f})

80 k J m o l^{- 1}

. Enthalpy change,

Δ H = - 40 k J m o l^{- 1}

for the reaction. A catalyst lowers

E_{a f}

20 k J

m o l^{- 1}

. The ratio of energy of activation for reverse reaction before and after addition of catalyst is:

The energies of activation for forward and reverse reactions for $A_{2} + B_{2} ⇌ 2 A B$ are $180 k J m o l^{- 1}$ and $200 k J m o l^{- 1}$ respectively. The presence of a catalyst lowers activation energy of both reactions by $100 k J m o l^{- 1}$ . The enthalpy change of the reaction $(A_{2} + B_{2} \to 2 A B)$ in the presence of a catalyst will be (in kJ $m o l^{- 1}$ )

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What is the role of a catalyst in a reaction ?

The correct option is A Lowers the activation energyAll substances have average energy and before the reaction occurs energy of the reactant should be higher than the average energy. The catalyst lowers the activation clergy. Therefore, rate of reaction is increased.

The correct option is A Lowers the activation energy
All substances have average energy and before the reaction occurs energy of the reactant should be higher than the average energy. The catalyst lowers the activation clergy. Therefore, rate of reaction is increased.