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Harish observed the boiling points of oxygen, argon, nitrogen as $- 183 ° C$ , $- 186 ° C$ , $- 196 ° C$ respectively. These gases can be separated from each other (or air) by fractional distillation (evaporation). What is the principle used in the separation of these gases?

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Densities

Weak attractive forces between gases

Difference in the Boiling points

Different rates of diffusion and difference in miscibility.

answer is C.

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Detailed Solution

Gases can be classified according to their boiling points since nitrogen has the lowest of the three boiling points. After argon comes oxygen. Hence, the principle employed in the separation of these gases is the difference in boiling points.

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