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Question

Substance that is light-sensitive and is used on photographic films is:

  1. CuCl
  2. CaF2
  3. MgBr2
  4. AgBr

A
CaF2
B
MgBr2
C
CuCl
D
AgBr
Solution
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Silver bromide (AgBr) is light-sensitive and is used on photographic films.
Silver bromide is the most sensitive silver halide to photo-reduction. Hence, it is used as the light-sensitive material in photographic films.
2AgBrlight2Ag+Br2

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