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?
A
Gas Z will be at top of the vessel.
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B
Gas Y will be at the top of the vessel.
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C
Gas Z will be at the bottom and X will be at the top.
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D
Gases will form homogeneous mixture.
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Solution
The correct option is C Gases will form homogeneous mixture.
Gases of same or different molecular weight always mix homogeneously.
For instance, air is an example of homogeneous mixture. we know in air, contains 78% nitrogen, 21% oxygen and some amount of carbon and other gases. here you can see molecular weight of nitrogen , carbon dioxide and oxygen are different in spite of this, these are mix homogeneously.
same here, X , Y and Z are different gases and out in closed vessel at constant temperature then, after equilibrium, gases are homogeneously present in the vessel.