Chemical Process
Dry ice (solidified CO₂) is used for the

Liquefaction of natural gas
Liquefaction of permanent gases
Storage & shipment of frozen foods and ice-creams
None of these

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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

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

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