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


h2o2.png


(ii) Chemical equations for its decomposition reaction in light is as follows-


2H2O2 (l) 2H2O (l) + O2 (g)


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