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The mixture of petroleum ether and benzene is used in the elution ratio of ____________

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The mixture of petroleum ether and benzene is used in the elution ratio of ____________

(a) 1 : 2

(b) 1 : 5

(c) 1 : 9

(d) 1 : 12

This question was addressed to me in exam.

This intriguing question comes from Column Chromatography topic in division Methods of Purification of Engineering Chemistry I

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Correct choice is (c) 1 : 9

The explanation is: The mixture of petroleum ether and benzene is used in the elution ratio of 1:9 (V/V).

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