MCQ
$MnO_4^ - $ on reduction in acidic medium forms
- A$Mn{O_2}$
- ✓$M{n^{ + 2 }}$
- C$MnO_4^{ - 2 }$
- D$Mn$
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$Zn_{(s)} + Ag_2O_{(s)} + H_2O_{(l)} \rightleftharpoons $$2Ag_{(s)} + Zn^{2+}_{(aq)}+ 2OH^-_{(aq)}$
If half cell potentials are
$Zn^{2+}_{(aq)} + 2e^- \rightarrow Zn_{(s)}\,;\,\, E^o = - 0.76\, V$
$Ag_2O_{(s)} + H_2O_{(l)} + 2e^- \rightarrow 2Ag_{(s)} + 2OH^-_{(aq)}\,,$$E^o = 0.34\, V$
The cell potential will be ........... $V.$
Cu+ → Cu2+ + Cu
3MnO4– + 4H+ → 2MnO4– + MnO2 + 2H2O
2KMnO4 → K2MnO4 + MnO2 + O2
2MnO4– + 3Mn2+ + 2H2O → 5MnO2 + 4H+