Question

What is the molecularity of each of the following elementary reactions?

Part A

Cl2(g)→2Cl(g)

	unimolecular
	bimolecular
	termolecular

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Part B

OCl−(g)+H2O(g)→HOCl(g)+OH−(g)

	unimolecular
	bimolecular
	termolecular

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Part C

NO(g)+Cl2(g)→NOCl2(g)

	unimolecular
	bimolecular
	termolecular

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Part D

Write the rate law for the reaction in part A?

	rate=k[Cl2]2
	rate=k[Cl2]
	rate=k[Cl2]1/2

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Part E

Write the rate law for the reaction in part B?

	rate=k[OCl−][H2O]
	rate=k[OCl−]2[H2O]
	rate=k[OCl−][H2O]2

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Part F

Write the rate law for the reaction in part C?

	rate=k[NO][Cl2]
	rate=k[NO]2[Cl2]
	rate=k[NO][Cl2]2

Answer 1

Part A

One molecule of Cl2 is reacting to fom 2 moles of Cl.

Hence the reaction is unimolecular

Correct answer is Option A

Part B

One molecule of OCl- and one molecule of H2O is used as reactant.

Hence the reaction is bimolecular

Correct answer is Option B

Part C

The reaction is biomolecular

Since one molecule of NO and Cl2 is reacting

Part D

Rate = k[Cl2] Option B is correct

Part E

Rate = k[OCl-][H2O] Option A is correct

Part F

rate = k[NO][Cl2] Option A is correct