Chemical Reaction Engineering
In a reversible reaction, a catalyst increases the rate of forward reaction

And the backward reaction equally
To a greater extent than that of the backward reaction
Only
And decreases that of the backward reaction

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Chemical Reaction Engineering
A catalyst loses its activity due to

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

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