The correct statement for hydrogen peroxide $\left({\mathrm{H}}_{\mathrm{2}}{\mathrm{O}}_{\mathrm{2}}\right)$ is:

10 volume colm of H₂O₂  $\Rightarrow$ 1L of H₂O₂ give 10 L of O₂ at STP
$2{\mathrm{H}}_2{\mathrm{O}}_2\left(\mathrm{\ell }\right)⟶{\mathrm{O}}_2\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)$
22.4 L of H₂O₂ produced from 68g H₂O₂
10L of H₂O₂ produces = $\frac{68}{22.4}\times 10=30.357\mathrm{g}$
$\therefore$strength of H₂O₂ in 10 volume H₂O₂ solution = 30.357 g/L = 3.035%.
H₂O₂ is manufactured by electrolysis of 50% H₂SO₄ followed by vacuum distillation.