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Catalyst and Energy Profile

APCHEM-XJIDZN

The solid line in the reaction profile below shows the overall reaction profile for an uncatalyzed reaction. The dashed line shows a catalyzed profile for the same reaction.

Which of the following reaction mechanisms MOST accurately represents the reaction profile as represented by the dashed line?

Created for Albert.io. Copyright 2016. All rights reserved.

A

$O_{3(g)} \longrightarrow O_{2(g)} + O_{(g)} \quad$ slow
$O_{3(g)} + O_{(g)} \longrightarrow 2O_{2(g)} \quad$ fast

B

$ NO_{2(g)} + NO_{2(g)} \longrightarrow NO_{3(g)} + NO_{(g)} \quad$ fast
$ NO_{3(g)} + CO_{(g)} \longrightarrow NO_{2(g)} + CO_{2(g)} \quad$ slow

C

$ NO_{2(g)} + SO_{2(g)} \longrightarrow NO_{(g)} + SO_{3(g)} \quad$ slow
$2 \ NO_{(g)} + O_{2(g)} \longrightarrow 2 \ NO_{2(g)} \quad \quad \quad \quad$ fast

D

$ NO_{(g)} + N_2O_{(g)} \longrightarrow N_{2(g)} + NO_{2(g)} \quad$ fast
$2 \ NO_{2(g)} \longrightarrow 2 \ NO_{(g)} + O_{2(g)} \quad \quad \quad \quad$ slow