NEET Chemistry Redox Reactions Questions Solved


x gram of pure As2S3 is completely oxidised to respective highest oxidation states by 50 ml of 0.1 M hotacidified KMnO4 then x mass of As2S3 taken is : (Molar mass of As2S3 = 246)

(1) 22.4 g

(2) 43.92 g

(3) 64.23 g

(4) None

(2) 5As2S3 + 28KMnO4 + H+ → 10H3AsO4 + 28Mn2+ + SO42-

m moles of KMnO4 = 50 × 0.1 = 5

28 mmoles of KMnO4 → 5 mMoles of As2S3

1 mmoles of KMnO4 → 5/28 mmoles of As2S3

Mass of As2S3 = x = 246 × 528 g = 43.92 g

Difficulty Level:

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