Question

Compound X, which is used for drinking, has pH value 7. Electrolysis of an acidic solution of
X gives gases Y and Z. The volume of Y is twice that of Z. Y burns rapidly while Z supports
burning. Identify X, Y and Z and write the equations for the described reactions.

Answer 1

x- water
y-hydrogen
z-oxygen

when electricity is passed through water mixed with acid hydrogen and oxygen is formed.

Answer 2

Compound X is H2O 
Hydrolysis of H2O gives Y=H2 ( WHICH BURNS RAPIDLY) and Z= O2 
(WHICH WILL SUPPORT BURNING)

2 H2O --------- 2 H2 + O2
   (X)                  (Y)     (Z)