4. A sample of 0.2000 g of ore containing MnO2 was treated with an excess of concentrated HCl. The Cl2 formed during the reaction was distilled off and KI was absorbed. 42.50 cm3 of 0.05200 N thiosulphate solution was used for titration of the released iodine. How much MnO2 (in %) does the ore contain?

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