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Chapter 7: Problem 6

The one which is a unimolecular reaction is (a) \(2 \mathrm{HI} \rightarrow \mathrm{H}_{2}+\mathrm{I}_{2}\) (b) \(\mathrm{N}_{2} \mathrm{O}_{5} \rightarrow \mathrm{N}_{2} \mathrm{O}_{5}+(1 / 2) \mathrm{O}_{2}\) (c) \(\mathrm{H}_{2}+\mathrm{Cl}_{2} \rightarrow 2 \mathrm{HCl}\) (d) \(\mathrm{PCl}_{3}+\mathrm{Cl}_{2} \rightarrow \mathrm{PCl}_{5}\)

Short Answer

Expert verified
None of the options represents a unimolecular reaction.

Step by step solution

01

Analyze the given reactions

In this step, we analyze each of the given reactions by looking at the reactant side and count the number of molecules involved in the reaction. \n(a) \(2 HI \rightarrow H_{2}+I_{2}\): In this reaction, 2 molecules of Hydrogen Iodide are reacting. So, it's not unimolecular.\n(b) \(N_{2}O_{5} \rightarrow N_{2}O_{5}+(1 / 2)O_{2}\): This is incorrect. Reaction has the same molecule on both sides which is a mistake. \n(c) \(H_{2}+Cl_{2} \rightarrow 2 HCl\): Here, Hydrogen and Chlorine molecules are involved, so it's not unimolecular either.\n(d) \(PCl_{3}+Cl_{2} \rightarrow PCl_{5}\): In this reaction, two molecules, i.e., Phosphorus Trichloride and Chlorine are reacting. Hence, it's not unimolecular.
02

Final analysis and short answer

On analyzing all the options, it is seen that none of the reactions given in the options are unimolecular reactions. Therefore, none of the reactions mentioned in the question is unimolecular.

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Most popular questions from this chapter

The statement which is true in respect of order of a reaction is (a) it is always a whole number (b) it is always a fraction (c) it may be zero, a whole number or a fraction (d) it can never be a fraction

The rate constant of a reaction is equal to its rate constant at constant temperature when the concentration of the reactants is (a) unity (b) zero (c) two (d) three

On increasing temperature, rate of a reaction increases, because (a) the number of activated molecules increases (b) the number of activated molecules decreases (c) the number of activated molecules becomes zero (d) the activated molecules move with a low speed

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The half-life period of a reaction is independent of the initial concentration of the reactants. The reaction is of (a) first order (b) zero order (c) second order (d) third order
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