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# Activation Energy of Reactions

APCHEM-7PYEUV

Which of the following reactions has the lowest activation energy?

A

$H_2O + CO_2 \longleftrightarrow H_2CO_3$

In the presence of a catalyst.

B

$2H_2O \longleftrightarrow 2H_2 + O_2$

In an open system.

C

$H_2O + CO_2 \longleftrightarrow H_2CO_3$

In an open system.

D

$2H_2O \longleftrightarrow 2H_2 + O_2$

In an open system with an inhibitor.