Question

Write the half reactions for each of the following redox reactions:
$left parenthesis straight a right parenthesis space 2 Fe to the power of 3 plus end exponent left parenthesis aq right parenthesis space plus space 2 straight I to the power of minus left parenthesis aq right parenthesis space space rightwards arrow space space straight I subscript 2 left parenthesis straight s right parenthesis space plus space 2 Fe to the power of 2 plus end exponent left parenthesis aq right parenthesis left parenthesis straight b right parenthesis space Sn to the power of 2 plus end exponent left parenthesis aq right parenthesis space plus space 2 Hg to the power of 2 plus end exponent left parenthesis aq right parenthesis space rightwards arrow space space Sn to the power of 4 plus end exponent left parenthesis aq right parenthesis space plus space 2 straight H to the power of plus left parenthesis aq right parenthesis$

Solution

Redox reaction (a):
(i) Oxidation half-reaction.
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(ii) Reduction half-reaction
$2 Fe to the power of 3 plus end exponent plus space left parenthesis aq right parenthesis space plus space 2 straight e to the power of minus space space rightwards arrow space space space 2 Fe to the power of 2 plus end exponent left parenthesis aq right parenthesis$
For redox reaction (b):
(i) Oxidation half-reaction
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(ii) Reduction half-reaction
$left square bracket Hg to the power of 2 plus end exponent left parenthesis aq right parenthesis space plus space straight e to the power of minus space space rightwards arrow space Hg to the power of plus left parenthesis aq right parenthesis right square bracket space cross times space 2$
or
$2 Hg squared left parenthesis aq right parenthesis space plus space left parenthesis aq right parenthesis space 2 straight e to the power of minus space rightwards arrow space space 2 Hg to the power of 2 plus end exponent left parenthesis aq right parenthesis$

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Redox Reactions

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