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Which of the following noble gases is not obtained via fractional distillation?

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in Chemistry – Class 12 by (188k points)
Which of the following noble gases is not obtained via fractional distillation?

(a) Krypton

(b) Argon

(c) Neon

(d) Helium

This question was posed to me in an interview.

My query is from P-Block in section P-Block Elements of Chemistry – Class 12

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The correct answer is (d) Helium

The best explanation: Neon, argon, krypton and xenon are obtained by fractional distillation of air. Fractional distillation of liquid air gives oxygen, nitrogen and a mixture of noble gases. The individual noble gases are then separated by adsorption over coconut charcoal which adsorbs different gases at different temperatures.

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