
- 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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The above reaction has been studied at $800^{\circ} C$. The related data are given in the table below.
| Reaction serial number | Initial pressure of $H _{2}$ / $kPa$ | Initial Pressure of $NO /$ $kPa$ | Initial rate $\left(\frac{- dp }{ dt }\right) /( kPa / s )$ |
| $1$ | $65.6$ | $40.0$ | $0.135$ |
| $2$ | $65.6$ | $20.1$ | $0.033$ |
| $3$ | $38.6$ | $65.6$ | $0.214$ |
| $4$ | $19.2$ | $65.6$ | $0.106$ |
The order of the reaction with respect to $NO$ is $...........$
Correct order of $pK _{ a }$ value is:
