MCQ
Oxidation state of sulphur in tetrathionic acid is
- A$+6$
- B$+4$
- C$+6$ and $0$
- ✓$+5$ and $0$
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$Cu_{(s)} + 2Ag^+_{(aq)} \rightarrow Cu^{2+}_{(aq)} + 2Ag_{(s)}\,;$
$E^o = 0.46\, V$ at $298\, K$ is

$\frac{2}{3} Al_2 O_3 \rightarrow \frac{4}{3} Al + O_2$
$\Delta _rG = + 960\, kJ\, mol^{-1}$
The potential difference needed for the electrolytic reduction of aluminium oxide $(Al_2O_3)$ at $500^oC$ is at least ........ $V$.