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# A reaction was found to be second order with respect [ICl] and first order with respect to $[H_2]$ the overall order of $Rx^n$

$(a)\;3\qquad(b)\;1\qquad(c)\;2\qquad(d)\;1/2$

$r=k[ICl]^2[H_2]^1$
Order $2+1=3$
hence (a) is the correct answer.
edited Jul 24, 2014