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AS Chemistry kinetics MCQ

2H2(g) + 2NO(g) o 2H2O(g) + N2(g)
This reaction is first order with respect to hydrogen and second order with respect to
nitrogen(II) oxide.
By what factor will the initial rate increase if the concentration of hydrogen and
nitrogen(II) oxide are both tripled?
A 3
B 9
C 12
D 27
Reply 1
(3) x (3)^2 is 27.
Since H is first order, rate is proportional to its conc
But NO is second order so rate equals conc squared.

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