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Order of Reaction

X Y Z is a co...

Question

$X S t e p I - -- \to Y S t e p I I - --- \to Z$ is a complex reaction. Total order of reaction is 2 and step II is slow step. What is molecularity of step II?

A

2

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B

1

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C

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D

4

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Solution

The correct option is A 2
$X I \to Y I I - \to$ , is a complex reaction.
Total order of reaction is 2.
Molecularity of slowest step II is also 2 because for complex reaction, molecularity of the slowest step is same as the order of the overall reaction.

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For a complex reaction ......... .

(a) order of overall reaction is same as molecularity of the slowest step
(b) order of overall reaction is less than the molecularity of the slowest step
(c) order of overall reaction is greater than molecularity of the slowest step
(d) molecularity of the slowest step is never zero or non-integer

Q. Statement - I: For the reaction given below:

The molecularity of the first step is 1 and the second step is 2.

2 O_{3} (g) \to 3 O_{2} (g)

O_{3} (g) ⇌ O_{2} (g) + O (g)

O_{3} (g) + O s l o w - - \to 2 O_{2} (g)

Statement - II: O(g) is an intermediate. The rate of reaction is

K [O_{3}]^{2} [O_{2}]^{- 1}

and the order of the reaction is 1.

Q. For the reaction given below,

2 O_{3} (g) \to 3 O_{2} (g)

O_{3} (g) \to O_{2} (g) + O (g)

O_{3} (g) + O \to^{s l o w} 2 O_{2} (g)

Statement I: The molecularity of the first step is 1 and of the second step is 2.
Statement-II:

O (g)

is an intermediate and rate of reaction is

K [O_{3}]^{2} [O_{2}]^{- 1}

and order of reaction is 1.

Q. Assertion :Complex reaction takes place in different steps and the slowest step determines the rate of reaction. Reason: Order and molecularity of a reaction are always equal.

Q. Assertion :For the reaction given below, the molecularity of first step is 1 and of second step is 2.

2 O_{3} (g) \to 3 O_{2} (g)

O_{3} (g) ⇌ O_{2} (g) + O (g)

O_{3} (g) + O s l o w - - \to 2 O_{2} (g)

Reason: O(g) is an intermediate and rate of reaction is

K [O_{3}]^{2} [O_{2}]^{- 1}

and order of reaction is 1.

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