Chemical Reaction Engineering
During manufacture of H₂SO₄, the oxidation of SO₂ to SO₃ by oxygen is an en- dothermic reaction. The yield of SO₃ will be maximised, if the

Temperature is increased
Temperature is increased and pressure is reduced
Pressure is reduced
Temperature is reduced and pressure is increased

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Chemical Reaction Engineering
Promoter.

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

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

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