22. Which of the following examples is a decom
reaction?
(a) Evaporation of water
(b) Exposure of photographic film in the presence
light
(C) Heating sulphur in the presence of oxygen
(d) Dissolving salt in water
Answers
Answered by
10
answer: c) Heating sulphur in the presence of oxygen
Explanation: because sulphur + oxygen gives sulphur dioxide
S (sulfur) + O2 (oxygen) -----|> SO2 (sulfur dioxide)
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1
- Given question is wrong Which of the following examples is a decom reaction?
- It should be Which of the following examples is a decomposition reaction?
Option (b) is the correct answer
An example is a decomposition reaction is the Exposure of photographic film in the presence of light.
Explanation:
(B) Exposure of photographic film in the presence of light
Description:
- The photographic film contains silver bromide [AgBr] or silver chloride [AgCl], which decomposes when exposed to light and undergoes a photochemical decomposition reaction.
Cause. Presence of Sunlight or existence of sunlight
2AgBr (s) ⇒ 2Ag (s) + (g)
(existence of sunlight)
2AgCl (s) ⇒ 2Ag (s) + (g)
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