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Which of the following typically represents a photochemical reaction?

Chemistry
JAMB 2006

Which of the following typically represents a photochemical reaction?

  • A. Formation of water from hydrogen and oxygen molecules
  • B. Conversion of dinitrogen (IV) oxide to nitrogen (IV) oxide
  • C. Decomposition of calcium hydroxide to its oxide
  • D. Conversion of silver halides to grey metallic silver
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Correct Answer: Option D
Explanation

The correct answer is D. Conversion of silver halides to grey metallic silver.

This reaction is a classic example of a photochemical reaction:

                 2AgCl (silver chloride) + light energy → 2Ag (silver) + Cl₂ (chlorine)

In this reaction, light energy (typically ultraviolet or visible light) initiates the decomposition of silver chloride into silver metal and chlorine gas. This reaction is commonly used in photographic film and paper.

There is an explanation video available below.

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Explanation Video

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