Chemical Process
Wet chlorine gas produced during electrolysis of brine is dehydrated by

None of these
Passing it through a bed of silica gel
Passing it through a bed of diatomaceous earth
Spraying 66° Be H₂SO₄ counter current to the flow of the gas

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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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