Post-UTME Biology 2011 Objective — Question 15

Question 15 of 24 from the Post-UTME Screening (Post-UTME) Biology 2011 Objective paper, with the correct answer and a full explanation.

If 100cm3 of oxygen pass through a porous plug in 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is

A. 10.0s
B. 12.5sCorrect
C. 17.7s
D. 32.0s

Explanation

By Graham's law: t(H2) = 50 x sqrt(2/32) = 12.5s. (Note: this question is a near-duplicate of one found in the FUTO 2013/2014 Type D session in this same PDF set; the same independently-worked answer is used here.)

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