At $20.0\mathrm{m}\mathrm{L}$ solution containing $0.2\mathrm{g}$ impure ${\mathrm{H}}_2{\mathrm{O}}_2$ reacts completely with $0.316\mathrm{g}$ of ${\mathrm{K}\mathrm{M}\mathrm{n}\mathrm{O}}_4$ in acid solution. The purity of ${\mathrm{H}}_2{\mathrm{O}}_2$ (in %) is (mol. wt. of ${\mathrm{H}}_2{\mathrm{O}}_2=34$ ; mol. wt. of ${\mathrm{K}\mathrm{M}\mathrm{n}\mathrm{O}}_4=158$ ) 

<p>eq of&nbsp;<math><msub><mrow><mrow><mi mathvariant="normal">H</mi></mrow></mrow><mrow><mrow><mn>2</mn></mrow></mrow></msub><msub><mrow><mrow><mi mathvariant="normal">O</mi></mrow></mrow><mrow><mrow><mn>2</mn></mrow></mrow></msub><mo>=</mo></math>&nbsp;eq of&nbsp;<math><msub><mrow><mrow><mi mathvariant="normal">K</mi><mi mathvariant="normal">M</mi><mi mathvariant="normal">n</mi><mi mathvariant="normal">O</mi></mrow></mrow><mrow><mrow><mn>4</mn></mrow></mrow></msub></math></p><p><math><mtable columnalign="right"><mtr><mtd><mrow></mrow></mtd><mtd><mrow><mo>=</mo><mfrac><mrow><mrow><mn>0.316</mn></mrow></mrow><mrow><mrow><mn>158</mn></mrow></mrow></mfrac><mo>*</mo><mn>5</mn><mo>=</mo><mn>0.01</mn></mrow></mtd></mtr><mtr><mtd><mrow></mrow></mtd><mtd><mrow><mi></mi><mo>=</mo><mfrac><mrow><mrow><mn>0.01</mn><mo>*</mo><mn>17</mn></mrow></mrow><mrow><mrow><mn>0.2</mn></mrow></mrow></mfrac><mo>*</mo><mn>100</mn><mo>=</mo><mn>85</mn><mi mathvariant="normal">%</mi></mrow></mtd></mtr></mtable></math></p>

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