Chemical Reaction Engineering
A catalyst loses its activity due to

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

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Chemical Reaction Engineering
In the converter of the contact process for the manufacture of H₂SO₄ the equilibrium conversion of SO₂ __________ (i) __________ with increase in temperature and __________ (ii) __________ with increase in the mole ratio of SO₂ to air.

(i) decreases (ii) decreases
(i) decreases (ii) increases
(i) increases (ii) decreases
(i) increases (ii) increases

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Chemical Reaction Engineering
Promoter.

All of these
Atlers the position of equilibrium in a reversible reaction
Initiates a chemical reaction and is a catalyst by itself
Increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals

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