Answer:
5 volume \[{{H}_{2}}{{O}_{2}}\]solution
means that 1 volume of this solution will decompose to give 5 volumes of oxygen
at STP.
\[\underset{68g}{\mathop{2{{H}_{2}}{{O}_{2}}}}\,\to
{{H}_{2}}O+\underset{22.4L}{\mathop{{{O}_{2}}}}\,\]
5 L oxygen is obtained from
\[\frac{68\times
5}{22.4}g\,{{H}_{2}}{{O}_{2}}=15.08g{{H}_{2}}{{O}_{2}}\]
i.e., 15 g \[{{H}_{2}}{{O}_{2}}\]is
present in 1 L solution. Thus strength of the solution =15 g/L.
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