Chemical Process
In multistage equilibrium conversion of SO₂ to SO₃ (2SO₂ + O₂ ⇋ 2SO₃), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO₂ to SO₃ can be increased by

Increasing the oxygen concentration
Removing some quantity of SO₃ during intermediate stage
Putting more quantity of V₂O₅ catalyst in the converter
Maintaining low temperature & pressure in the converter

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Chemical Process
Enzymes are

Catalyst for temperature sensitive reactions
Proteins with high molecular weight (around 10, 000)
All of these
Derived from living organisms

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