SO₂ molecule is twice as heavy as O₂ molecule. Hence at 25ºC the ratio of the average kinetic energies of sulphur dioxide and oxygen is

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2 : 1

1 : 2

1 : 1

4 : 1

answer is A.

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Detailed Solution

One of the postulates of kinetic theory of gases states that all gases at a given temperature, the gases have the same average kinetic energy.
So, the average kinetic energy of an oxygen molecule at 25^oC is same as that of SO₂ molecule.

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