In MnO4- reacting with Fe2+ to give Mn2+ and Fe3+, how many Fe2+ ions per MnO4- ?
A5
B2
C3
D1
Answer & Solution
Correct answer: A. 5
Mn falls from +7 to +2 (decrease of 5) while each Fe rises by 1, so 5 Fe2+ ions are needed for each permanganate ion.
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