
- AThe molecule is planar
- B$8$ number of angles of the type $\theta_2$ are present
- ✓$\theta_3 > \theta_1 > \theta_2$
- DTotal $4$ unshared lone pairs are present

$\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{O\,\,\,\,\,\,\,O} \\
{||\,\,\,\,\,\,\,\,\,||}
\end{array}} \\
{{O^\Theta } - S - S - {O^\Theta }} \\
{||\,\,\,\,\,\,\,\,} \\
{O\,\,\,\,\,\,}
\end{array}$
$S_2O_8^{-2}$
$\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O} \\
{||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||}
\end{array}} \\
{{O^\Theta } - S - O - O - S - {O^\Theta }} \\
{||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||} \\
{O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O}
\end{array}$
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$\left( i \right)\,2F{e_2}{O_3}\left( s \right) \to 4Fe\left( s \right) + 3{O_2}\left( g \right)$
${\Delta _r}{G^o} = + 1487.0\,kJ\,mo{l^{ - 1}}$
$\left( {ii} \right)\,2CO\left( g \right) + {O_2}(g) \to 2C{O_2}\left( g \right)$
${\Delta _r}{G^o} = - 514.4\,kJ\,mo{l^{ - 1}}$
Free energy change, $\Delta_rG^o$ for the reaction
$\,2F{e_2}{O_3}\left( s \right) + 6CO\left( g \right) \to 4Fe\left( s \right) + 6C{O_2}\left( g \right)$ will be .....$kJ\, mol^{-1}$