A quantity of 1.6 g of pyrolusite ore was treated with 50 ml of 1.0 N-oxalic acid and some sulphuric acid. The oxalic acid left undecomposed was raised to 250 ml in a flask. A volume of 25 ml of this

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A quantity of 1.6 g of pyrolusite ore was treated with 50 ml of 1.0 N-oxalic acid and some sulphuric acid. The oxalic acid left undecomposed was raised to 250 ml in a flask. A volume of 25 ml of this solution when titrated with 0.1 N - KMnO₄ required 32 ml of the solution. The percentage of available oxygen in the ore is

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Oxalic acid taken = 50×1.0 = 50 meq. Leftover: 25 ml aliquot needs 32×0.1 = 3.2 meq, so total leftover = 32 meq. Consumed by ore = 50-32 = 18 meq. Available oxygen (eq wt 8) = 18×8 = 144 mg. %O = 144/1600×100 = 9%. Ans 0009.

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