Question

Which is wrong about a positive catalyst?

• A. It lowers the energy of activation of forward reaction
• B. It lowers the threshold energy level
• C. It lowers the energy of activation of backward reaction
• D. It makes the reaction more exothermic or endothermic

Answer 1

Answer: (D)

It makes the reaction more exothermic or endothermic

Catalyst cannot make the reaction more exothermic or endothermic.

$\Delta H=E_{a\left(f\right)}-E_{a\left(b\right)}$ is fixed for a reaction since catalyst change the activation by equal magnitude in both forward and backward reaction.