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Explanation:
Question -
The electrolytic decomposition of water gives H2 and O2 in the ratio of
a) 1:2 by volume
b) 2:1 by volume ✔
c) 2:1 by mass
d) 1:2 by mass
Additional information :-
Chemical equation -
Types of chemical reaction :-
Those reaction in which two or more substances combined to form a single substance, are called combination reaction.
Those reaction in which a compound splits up into two or more simpler substances are known as decomposition reaction.
Those reaction in which one element takes the place of another element in a compound, are known as Displacement reaction.
Those reaction in which two compounds react by an exchange of ions to form two new compounds are called double displacement reaction.