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x gram of pure As2S3 is completely oxidized to respective highest oxidation states by 50 ml of 0.1 M hot acidified KMnO4 then x mass of As2S3 taken is : (Molar mass of As2S3 = 246)
Sol. 5As2S3 + 28KMnO4 + H+ ® 10H3AsO4 + 28Mn2+ + SO42–
mmoles of KMnO4 = 50 × 0.1 = 5
28 mmoles of KMnO4 ® 5 moles of As2S3
1 mmole of KMnO4 ® 5/28 moles of As2S3
Mass of As2S3 = x = 246 x g = 43.92 g
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