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Question

Which of the following stlatement(s) is/are correct.

A
0.2 moles of KMnO4 will oxidise one mole of ferrous ions to ferric ions in acidic medium.
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B
1.5 moles of KMnO4 will oxidise 1 mole of ferrous oxalate to one mole of ferric ion and carbon dioxide in acidic medium in acidic medium
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C
0.6 moles of KMnO4 willoxidise 1 mole of ferrous oxalate to one mole of ferric ion and carbon dioxide in acidic medium
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D
1 mole of K2Cr2O7 will oxidise 2 moles of ferrous oxalate to ferric ions and carbon dioxide in acidic medium
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Solution

The correct option is D 1 mole of K2Cr2O7 will oxidise 2 moles of ferrous oxalate to ferric ions and carbon dioxide in acidic medium
MnO4+5e+8H+Mn2++4H2O
1 mole of MnO4, accepts 5 mole of e
15mole of MnO4, accepts 1 mole of e
0.2 mole of MnO4, accepts 1 mole of e
0.6 mole of MnO4, accepts 3 mole of e
Fe2+Fe3+
1 mole of Fe2+ will liberate 1 mole of e
Cr2O27+6e+14H+2Cr3++7H2O
1 mole of Cr2O27 will accept 1 moles of e
1 mole of FeC2O4Fe3++CO2+3e
1 mole of ferrous oxalate gives 3 moles of e
0.2 mole of MnO4=15mole of MnO4 oxidises 1 mole of Fe2+ ions(Tallies with statement a)
0.6 mole of MnO4 will oxidise 35mole of MnO4 oxidises 1 mole of ferrous oxalate.(Tallies with statement c)
1 mole of Cr2O27 will oxidise 2 mole of ferrous oxalate.(Tallies with statement d)
Hence, (a), (c), (d) are correct whereas (b) is incorrect

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