Choose ALL correctanswer (s)

The rate law for the reaction 2NO (g) + Cl 2 (g) → 2NOCl (g) is given by R=k[NO][Cl2]

If the following is the mechanism for the reaction,

NO (g) + Cl2 (g) → NOCl2 (g)

NOCl2 (g) + NO (g) → 2NOCl (g)

Which statements accurately describes this reaction? Check allthat apply

a) second order reaction.

b) The first step is the slow step.

c) Doubling [NO] would decrease the rate by a factor oftwo.

d) The molecularity of the first step is 1.

e) Both steps are termolecular.

The correct answers "a) second order reaction." and "b) The first step is the slow step."

Explanation:

Order of NO = 1

Order of Cl₂ = 1

Overall order = 1 + 1 = 2

∴ the order is a second order reaction

Mechanism of the given reaction:

NO (g) + Cl₂ (g) → NOCl₂ (g) ... Slow Step

NOCl₂ (g) + NO (g) → 2NOCl (g) ... Fast step

The first step is the determining step, which is the slow step

The incorrect statements are:

"c) Doubling [NO] would decrease the rate by a factor of two. "

When the concentrations of [NO] is doubled, the rate of the reaction is increased by the factor of two.

"d) The molecularity of the first step is 1. "

Since the overall reaction is 2, the molecularity of the first step is 2.

"e) Both steps are termolecular."

No, because the first step is bimolecular step.