Chemical Reaction Engineering
The reason why a catalyst increases the rate of reaction is that, it

None of these
Decreases the molecular collision diameter
Decreases the energy barrier for reaction
Increases the activation energy

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Chemical Reaction Engineering
In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for

Fast reactions in catalyst of small pore diameter
Slow reactions in catalyst of small pore diameter
Fast reaction in catalyst of large pore diameter
Slow reactions in catalyst of large pore diameter

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