Chemical Reaction Engineering
In the reversible reaction of the type, A + B ⇋ AB, in general

Both forward and backward reactions will be exothermic
Neither of the reactions will be en-dothermic
The combination reaction will be exothermic, while the dissociation reaction will be endothermic
The combination reaction will be endothermic, while the dissociation reaction will be exothermic

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Chemical Reaction Engineering
A catalyst loses its activity due to

Agglomeration of metal particles caused by thermal sintering of the solid surface
Loss in surface area of the active component
All of these
Covering of the catalytic active sites by a foregin substance

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