Answer :

‘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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