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KMnO 4 is titrated with ferrous ammonium sulphate hexahydrate in presence of dilute H 2 SO 4 . Number of water molecules produced for 2 molecules of KMnO 4 is _ _ _ _ _ _ _

Correct answer

68

Step-by-step solution

By balancing redox reaction: 10 [ FeSO 4 . ( NH 4 ) 2 SO 4 . 6 H 2 O ] + 2 KMNO 4 + 8 H 2 SO 4 → 5 Fe 2 ( SO 4 ) 3 + 2 MnSO 4 + 10 ( NH 4 ) 2 SO 4 + K 2 SO 4 + 68 H 2 O 8 H + + MnO 4 - + 5 Fe + 2 ⟶ 5 Fe + 3 + Mn + 2 + 4 H 2 O For 2 moles of MnO 4 - ,   8   moles of H 2 O . are released 5 moles of Mohr's salt contain 30 moles of H 2 O . So, 10 moles of Mohr's salt contain 60 moles of H 2 O So, total moles of H 2 O produced = 68

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