A quantity of 1.2 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

Question

A quantity of 1.2 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 - KMn O 4 ​ required 35 ml of the solution. The percentage of available oxygen in the ore is

TestHub · Accepted Answer

Oxalic acid taken = 50 meq. Leftover: aliquot needs 35 × 0.1 = 3.5 meq, total = 35 meq. Consumed = 15 meq. Available O = 15 × 8 = 120 mg. %O = 120/1200×100 = 10%. Ans 0010.

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