13. For the following mixtures, (a) H2-Oz at 1 atm and 273 K, (b) N2-O2 at I atm and 273 K, (c) dilute aqucous ethanol solution at 298 K, and (d) Cd in Cu at 293 K, place them in the order of increasing mass diffusivity.
(A) (a)(b)(c)(d),
(B) (c)(d)(a)(b),
(C) (d)(c)(a)(b),
(D) (d)(c)(b)(a)
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