Chemical Reaction Engineering
For a tubular reactor with space time 'τ' and residence time 'θ', the following statement holds good.

τ = θ , for a non-isothermal reactor
τ = θ , for an isothermic tubular reactor in which the density of the process fluid is constant
τ = θ , when the fluid density changes in the reactor
τ and θ are always equal

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

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