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Balance the following equations by the i...

Balance the following equations by the ion electron method:
a. `MnO_(4)^(Ө) + Cl^(Ө) + H^(o+) rarr Mn^(2+) + H_(2)O + Cl_(2)`
b. `Cr_(2)O_(7)^(2-) + I^(Ө) + H^(o+) rarr Cr^(3+) + H_(2)O + I_(2)`
c. `H^(o+) + SO_(4)^(2-)+I^(Ө) rarr H_(2)S+H_(2)O+I_(2)`
d. `MnO_(4)^(Ө)+Fe^(2+) rarr Mn^(2+) + Fe^(3+) + H_(2)O`

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