Chemical Reaction Engineering
If helium is introduced in a reactor containing O₂, SO₂ and SO₃ at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO₃ (as per Le Chatlier principle)

Changes unpredictably
Remains unaltered
Increases
Decreases

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Chemical Reaction Engineering
The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the

Value of threshold energy decreases
Collision frequency increases
Fraction of molecules having threshold energy increases
Increased temperature reduces the activation energy

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Chemical Reaction Engineering
Pick the WRONG design guideline for a reactor in which the reactions, A → R (desired) and A → S (undesired) are to take place. The ratio of the reaction rates is rR/rS = (k₁/k₂).Csub>Aa-b

Use CSTR with a high conversion, when a > b
Use high pressure and eliminate inerts, when a > b
Use batch reactor or plug flow reactor, when a > b
Avoid recycle, when a > b

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