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Alkaline pyrogallol absorbs O2 and oil of cinnamon absorbs O3.

1. Oxygen has higher b.p.t. than nitrogen therefore it can be obtained from air by fractional distillation.
2. Air is liquified by making use of the Joule-Thomson effect (cooling by expansion of the gas). Water vapour and CO2 are removed by solidification.
3. The remaining constituents of liquid air i.e., liquid oxygen and liquid nitrogen are separated by means of fractional distillation.
4. Undecomposed AgBr forms a soluble complex with hypo AgBr + 2Na2S2O3 → Na3[Ag(S2O3)2] + NaBr (soluble complex)

Correct answer: Air is liquified by making use of the Joule-Thomson effect (cooling by expansion of the gas). Water vapour and CO2 are removed by solidification.

Solution

Option B correctly describes the process of air liquefaction using the Joule-Thomson effect, where cooling by gas expansion is utilized, and water vapor and CO2 are removed by solidification.

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