Which of the following half-reactions is correctly balanced?
A
MnO−4→Mn2++4H2O
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B
Cu+2Ag+→2Ag+Cu2+
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C
H2+OH−→2H2O
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D
Pb2++2e−→Pb
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E
2F−+2e−→F2
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Solution
The correct option is DPb2++2e−→Pb The half-reaction of the option (D) is correctly balanced. Pb2+2e−→Pb The total charges on a left-hand side of the reaction is equal to total charges on the right-hand side of the reaction. Total mass on the left-hand side of the reaction is equal to the total mass on the right-hand side of the reaction.