Question

For what purpose is the Rhodium used?

(a) To reduce CO and HC

(b) To reduce NOx

(c) To reduce CO

(d) To reduce HC

The question was posed to me in quiz.

This intriguing question comes from Engine Emissions in chapter Emission Control Methods, Electric & Conventional Vehicles of Automobile Engineering

Answer 1

Correct answer is (b) To reduce NOx

Explanation: Rhodium is used to reduce NOx. It is used to clean vehicle emission. It is mixed with the other two metals – platinum and palladium.