Chemistry - Concentration Terms Question with Solution | TestHub

$\begin{array}{rl}& 2\mathrm{KI}+{\mathrm{H}}_2{\mathrm{SO}}_4+{\mathrm{H}}_2{\mathrm{O}}_2⟶{\mathrm{K}}_2{\mathrm{SO}}_4+2{\mathrm{H}}_2\mathrm{O}+{\mathrm{I}}_2\\ & 2{\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3+{\mathrm{I}}_2⟶{\mathrm{Na}}_2{\mathrm{S}}_4{\mathrm{O}}_6+2\mathrm{NaI}\end{array}$ milli eq. of ${\mathrm{H}}_2{\mathrm{O}}_2$ in $25\mathrm{mL}=20\times 0.3=6$ milli eq. of ${\mathrm{H}}_2{\mathrm{O}}_2$ in $1000\mathrm{mL}=\frac{6}{25}\times 1000=240$ Equivalent per litre $=\frac{240}{1000}$ Gram per litre of ${\mathrm{H}}_2{\mathrm{O}}_2=\frac{240}{1000}\times 17=4.08\mathrm{g}/\mathrm{L}$ (Equivalent weight of ${\mathrm{H}}_2{\mathrm{O}}_2=\frac{34}{2}=17$ ).