Chemical Reaction Engineering
The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the

Molecularity of the reaction is 2, but the reaction may not be elementary
Reaction is elementary with a molecularity of 2
Reaction may be elementary with molecularity of 2
Reaction is elementary but the molecularity may not be 2

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

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