For for forward and backward reaction are 180 and 200 kJ respectively. If catalyst lowers for both reactions by 100 kJ . Which of the following statement is correct? [2025]

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Q.
For $A_{2} + B_{2} ⇌ A B$

$E_{a}$ for forward and backward reaction are 180 and 200 kJ ${mol}^{- 1}$ respectively.

If catalyst lowers $E_{a}$ for both reactions by 100 kJ ${mol}^{- 1}$ .

Which of the following statement is correct [2025]

1 Catalyst does not alter the Gibbs energy change of a reaction.

2 Catalyst can cause non-spontaneous reactions to occur.

3 The enthalpy change for the reaction is +20 kJ ${mol}^{- 1}$ .

4 The enthalpy change for the catalysed reaction is different from that of uncatalysed reaction.

Ans.
(1)

A catalyst does not change Gibbs energy, enthalpy or equilibrium constant of a reaction. Enthalpy change for both catalyzed and uncatalyzed path is –20 kJ/mol.

Solution

Q.
For $A_{2} + B_{2} ⇌ A B$

$E_{a}$ for forward and backward reaction are 180 and 200 kJ ${mol}^{- 1}$ respectively.

If catalyst lowers $E_{a}$ for both reactions by 100 kJ ${mol}^{- 1}$ .

Which of the following statement is correct [2025]

1 Catalyst does not alter the Gibbs energy change of a reaction.

2 Catalyst can cause non-spontaneous reactions to occur.

3 The enthalpy change for the reaction is +20 kJ ${mol}^{- 1}$ .

4 The enthalpy change for the catalysed reaction is different from that of uncatalysed reaction.

Ans.
(1)

A catalyst does not change Gibbs energy, enthalpy or equilibrium constant of a reaction. Enthalpy change for both catalyzed and uncatalyzed path is –20 kJ/mol.

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Solution

Q. For A2+B2⇌AB Ea for forward and backward reaction are 180 and 200 kJ mol-1 respectively. If catalyst lowers Ea for both reactions by 100 kJ mol-1. Which of the following statement is correct [2025]

1 Catalyst does not alter the Gibbs energy change of a reaction.

2 Catalyst can cause non-spontaneous reactions to occur.

3 The enthalpy change for the reaction is +20 kJ mol-1.

4 The enthalpy change for the catalysed reaction is different from that of uncatalysed reaction.

Ans. (1) A catalyst does not change Gibbs energy, enthalpy or equilibrium constant of a reaction. Enthalpy change for both catalyzed and uncatalyzed path is –20 kJ/mol.

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Q.
For $A_{2} + B_{2} ⇌ A B$

$E_{a}$ for forward and backward reaction are 180 and 200 kJ ${mol}^{- 1}$ respectively.

If catalyst lowers $E_{a}$ for both reactions by 100 kJ ${mol}^{- 1}$ .

Which of the following statement is correct [2025]

3 The enthalpy change for the reaction is +20 kJ ${mol}^{- 1}$ .

Ans.
(1)

A catalyst does not change Gibbs energy, enthalpy or equilibrium constant of a reaction. Enthalpy change for both catalyzed and uncatalyzed path is –20 kJ/mol.