Question 67
HardOriginal questionWhite silver chloride turns grey when left in sunlight. This reaction, once used in black-and-white photography, is a
Show the answer and explanation
CorrectNot quiteAnswer B
Correct answer: B
Explanation
2AgCl → 2Ag + Cl₂ in sunlight.
Light splits the compound into silver (grey) and chlorine: a photolytic decomposition.
Worth noting
Sunlight supplies energy but is not an element, so it cannot displace anything.
- Concept
- Decomposition by light
- Typical timeTypical
- 90 s
- Your timeYours
- —
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