21 Balance the following redox reactions by ion - electron method:
a) Cr207(aq)2-+ 5032-(g) →Cr3. (aq) + 502-(aq) (धीय घोल में)
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The oxidation half reaction is SO2(g)+2H2O(l)→SO42−+4H+(aq)+2e−.
The reduction half reaction is Cr2O72−(aq)+14H+(aq)+6e−→2Cr3+(aq)+7H2O(l).
The oxidation half reaction is multiplied by 3 and added to the reduction half reaction to obtain the balanced redox reaction.
Cr2O72−+3SO2(g)+2H+(aq)→2Cr3+(aq)+3SO42−(aq)+H2O(l)
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