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Three different gases X, Y and Z of mole...

Three different gases X, Y and Z of molecular masses 2, 16 and 64 were enclosed in a vessel at constant temperature till equilibrium is reached. Which of the following statement is correct ?
Gas Z will be be at the top of the vessel
(2) Gas Y will be at the top of the vessel
Gas Z will be at the bottom and X will be at the top
Gas X will be at sthe bottom and Z will be at the top.
Gases will form homogeneous mixture.

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