‘A’ is Hydrogen peroxide i.e. H2O2.
Hydrogen peroxide contains H and O elements only. It decomposes slowly on exposure of light whose equation is as follows- 2H2O2 (l)→ 2H2O (l) + O2 (g)
And that’s why it is stored in wax-lined glass or plastic vessels in dark or urea can be added as a stabilizer.
(i) Possible structure of hydrogen peroxide is
(ii) Chemical equations for its decomposition reaction in light is as follows-
2H2O2 (l)→ 2H2O (l) + O2 (g)
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