Boiling points of a few gases are given below:

If liquid mixture of these gases is fractionally distilled, the order of gases distilling out from first to last is

Options

A. `W, X, Y, Z`
B. `X, Y, Z, W`
C. `Y, X, Z, W`
D. `Z, X, Y, W`

Answer

B

Explanation

The gas having lowest boiling point i.e., highly volatile will be distilled out first and the gas having highest boiling point i.e., least volatile will be distilled out at the last. So, the correct order of gases distilling out is X, Y, Z, W.