A solution contains mixture of H₂SO₄, H₂C₂O₄. 20 ml of this solution requires 40 ml of M/10 NaOH for neutralization and 20 ml of N/10 KMnO₄ for oxidation. The molarity of H₂C₂O₄, H₂SO₄ are

Let molarity of H₂SO₄ =M1 and
H₂C₂O₄=M₂
No.of milli equivalents of
(H₂SO₄ + H₂C₂O₄ ) = No.of milli equivalent of NaOH
$\begin{array}{l}20\left(2{\mathrm{M}}_1+2{\mathrm{M}}_2\right)=40\times \frac{1}{10}\\ 40\left({\mathrm{M}}_1+{\mathrm{M}}_2\right)=4{\mathrm{M}}_1+{\mathrm{M}}_2=0.1\end{array}$
No.of milli equivalents of H₂C₂O₄ = No.of milli equivalents KMnO₄
$\begin{array}{l}20\left(2{\mathrm{M}}_2\right)=20\times \frac{1}{10};{\mathrm{M}}_2=\frac{1}{20}=0.05\mathrm{M}.\\ {\mathrm{M}}_1=0.1-0.05=0.05\mathrm{M}\end{array}$