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Chapter 8: Problem 4

Which is not an example of homogeneous catalyst? (a) Formation of \(\mathrm{SO}_{3}\) in chamber process (b) Formation of \(\mathrm{SO}_{3}\) contact process (c) Hydrolysis of methyl acetate in the presence of an acid (d) Decomposition of \(\mathrm{KClO}_{3}\) in the presence of \(\mathrm{MnO}_{2}\)

Short Answer

Expert verified
The answer is (b) Formation of \(\mathrm{SO}_{3}\) contact process. \(\mathrm{SO}_{2}\) is oxidized to \(\mathrm{SO}_{3}\) in the presence of \(\mathrm{V}_{2}\mathrm{O}_{5}\). The catalyst (\(\mathrm{V}_{2}\mathrm{O}_{5}\)) is solid while the reactants and products are gases, hence this an example of heterogeneous catalysis and not homogeneous catalysis.

Step by step solution

01

Analyzing Option (a)

Formation of \(\mathrm{SO}_{3}\) in chamber process: In this process, \(\mathrm{SO}_{2}\) and \(\mathrm{O}_{2}\) gas react to form \(\mathrm{SO}_{3}\) gas in the presence of nitrogen oxides which act as a homogeneous catalyst because they are all in the same phase (gas). So, it is an example of homogeneous catalysis.
02

Analyzing Option (b)

Formation of \(\mathrm{SO}_{3}\) contact process: In this process, \(\mathrm{SO}_{2}\) is oxidized to \(\mathrm{SO}_{3}\) in the presence of \(\mathrm{V}_{2}\mathrm{O}_{5}\). The catalyst (\(\mathrm{V}_{2}\mathrm{O}_{5}\)) is solid while the reactants and products are gases, hence this an example of heterogeneous catalysis and not homogeneous catalysis.
03

Analyzing Option (c)

Hydrolysis of methyl acetate in the presence of an acid: In this reaction, the reactant (methyl acetate), the product (methanol and acetic acid) and the catalyst (an acid) are all in the same phase (liquid). Hence, this is an example of homogeneous catalysis.
04

Analyzing Option (d)

Decomposition of \(\mathrm{KClO}_{3}\) in the presence of \(\mathrm{MnO}_{2}\): In this process, \(\mathrm{KClO}_{3}\), a solid, decomposes in the presence of a solid catalyst, \(\mathrm{MnO}_{2}\), to produce \(\mathrm{KCl}\) and \(\mathrm{O}_{2}\). Hence, this is an example of homogeneous catalysis.

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Most popular questions from this chapter

Which of the following statements is not correct? (a) Catalyst action is specific. (b) A catalyst does not alter the equilibrium. (c) A small amount of catalyst is sufficient to catalyse a reaction. (d) The catalyst initiates the reaction

A catalyst is a substance which (a) increases the equilibrium concentration of the products (b) changes the equilibrium constant of the reaction (c) shortens time to reach equilibrium (d) supplies energy to the reaction

The name catalyst was proposed by (a) Rutherford (b) Langmuir (c) Graham (d) Berzelius

In the reaction \(\mathrm{KMnO}_{4}+\mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{C}_{2} \mathrm{O}_{4} \rightarrow\) Products, \(\mathrm{Mn}^{2+}\) ions act as a/an (a) positive catalyst (b) negative catalyst (c) auto catalyst (d) enzyme catalyst

A substance which decreases the rate of a reaction is a/an (a) inhibitor (b) poison (c) moderator (d) promoter
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