Which statement best describes the use of catalytic converters in automobiles? a. they decrease the rate of the reactions that produce harmful gases. b. they oxidize hydrocarbons to form less toxic gases. c. they combine the larger hydrocarbon molecules with smaller ones. d. they increase reaction temperature for cleaner burning.

Option (B) is the correct answer.

Explanation:

A device placed in the exhaust system of an automobile with the help of which harmful effects of pollutant gases can be decreased.

These are used in the oxidation-reduction of toxic by products like nitrogen, hydrocarbons, carbon monoxide etc into less hazardous substances.

Thus, we can conclude that the statement they oxidize hydrocarbons to form less toxic gases, best describes the use of catalytic converters in automobiles.

 B. They oxidize hydrocarbons to form less toxic gases.

Explanation:

A catalytic converter is a device which is used in automobile engine to convert the harmful gaseous exhaust into a less toxic pollutant after the process of combustion of the fuel. It conducts an internal redox (oxidation-reduction) reaction in the automobile engine to facilitate such conversion.

On the basis of the above information, They oxidize hydrocarbons to form less toxic gases is the correct option.

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