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Write the half reactions for the followi...

Write the half reactions for the following redox reactions:
(a) `2Fe_((aq.))^(3+)+2I_((aq.))^(-)rarr2Fe_((aq.))^(2+)+I_(2(aq.))`
(b) `Zn_((s))+2H_((aq.))^(+)rarrZn_((aq.))^(2+)+H_(2(g))`
(c ) `Al_((s))+3Ag_((aq.))^(+)rarrAl_((aq))^(3+)+3Ag_((s))`

Text Solution

Verified by Experts

(a) `2Fe^(3+)(aq) +2I^(-) (aq) rarr2Fe^(2+) (aq) +I_2(aq)`
Oxidation half reaction :
`2I^(-)(aq)rarrI_2(aq)+2e^(-)`
Reduction half reaction :
`2Fe^(3+)(aq)+2e^(-)(aq)rarr2Fe^(2+)(aq)`
(b) `Zn(s)+2H^(+)(aq)rarrZn^(2+)(aq)+H_2(g)`
Oxidation half reaction :
`Zn(s) rarr Zn^(2+) (aq) +2e^(-)`
Reduction half reaction.
`2H^(+)(aq) rarrH_2(g)`
(c) `Al(s)+3Ag^(+)(aq) rarrAl^(3+)(aq)+3Ag(s)`
Oxidation half reaction :
`Al(s) rarrAl^(3+) (aq) +3e^(-)`
Reduction half reaction :
`3Ag^(+)(aq) +3e^(-) rarr 3Ag(s)`
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