Adding a catalyst to a reaction at equil...

Adding a catalyst to a reaction at equilibrium

changes Q

changes `K_(eq)`

changes both `Q` and `K_(eq)`

changes neither `Q` nor `K_(eq)`

Text Solution

Verified by Experts

The correct Answer is:

Adding a catalyst to a reaction at equilibrium has no effect on the value of Q and `K_(aq)` because a catalyst affects the activation energy of both forward and reverse reactions equally. It changes both rate constants `(K_(f)` and `K_(b))` by the same factor. So their ratio, `K_(aq)`, does not change.

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Catalyst in a reaction

Lowers the activation energy

Increases the rate of reaction

Both (a) and (b)

Initiates the reaction

Which reaction characteristics are changing by the addition of a catalyst to a reaction at constant teinperature? (i) Activation energy (ii) Equilibrium constant (iii) Reaction entropy (iv) Reaction enthalpy

Only (i)

Only (iii)

Only (i) and (ii)

All of these

Which reaction characteristics are changing by the addition of a catalyst to a reaction at constant temperature (i) Activation energy (ii) Equilibrium constant (iii) Reaction entropy (iv) Reaction enthalpy

(i) only

(iii) only

(i) and (ii) only