1.6 g pyrolusite ore was titrated with 50 cm of 1.0 N oxalic acid and some sulphuric acid

CHEMISTRY · Subjective · CBSE · Chemistry · Redox Reactions · Redox Reactions

Problem

1.6 g pyrolusite ore was titrated with 50 cm

^3

of 1.0 N oxalic acid and some sulphuric acid. The oxalic acid left was raised to 250 mL in a flask. 25 mL of this solution when treated with 0.1 N

\mathrm{KMnO_4}

required 32 mL of the solution. The percentage of available oxygen in pyrolusite is :