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X ml of ${\mathrm{H}}_{2}$ gas effuses through a hole in a container in 5 seconds. The time taken for the effusion of the same volume of the gas specified below under ideal condition is

(A) 10 seconds : $\mathrm{He}$

(B) 20 seconds : ${\mathrm{O}}_{2}$

(C) 25 seconds : $\mathrm{CO}$

(D) 55 seconds : ${\mathrm{CO}}_{2}$