In the CFC-driven chain Cl• + O 3 → ClO• + O 2 followed by ClO• + O → Cl• + O 2 , the species ClO• is best described as:

The actual catalyst that is regenerated in the reaction

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In the CFC-driven chain Cl• + O3 → ClO• + O2 followed by ClO• + O → Cl• + O2, the species ClO• is best described as:

Answer: A reaction intermediate, while Cl• is the regenerated catalyst.

A The final stable product
B An inert spectator
C The actual catalyst that is regenerated in the reaction
D A reaction intermediate, while Cl• is the regenerated catalyst

Correct answer: D. A reaction intermediate, while Cl• is the regenerated catalyst

Explanation: Cl• is consumed in step one and regenerated in step two, so it acts as a catalyst; ClO• is formed and then used up, making it a reaction intermediate.

Classical smog is a reducing mixture of SO₂ and fog, while photochemical smog is an oxidising mixture generated by UV-driven reactions of NOx and hydrocarbons.

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Understand how human activities alter the atmosphere, water, and soil. Covers air pollutants, smog types, ozone depletion, acid rain, greenhouse effect, water and soil pollution, and the principles of green chemistry.

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In the CFC-driven chain Cl• + O<sub>3</sub> → ClO• + O<sub>2</sub> followed by ClO• + O → Cl• + O<sub>2</sub>, the species ClO• is best described as:

Concept context

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