- ✓

- B

- C

- DAll





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$ NH_3(g) \rightleftharpoons \frac{1}{2}\,{N_2}\left( g \right) + \frac{3}{2}{H_2}\left( g \right);\,{K_2}$
$\frac{1}{2}\,{N_2}\left( g \right) + \frac{3}{2}{H_2}\left( g \right) \rightleftharpoons NH_3(g); K_3$
$2NH_3(g) \rightleftharpoons N_2(g) + 3H_2(g); K_4$
If $K_1 = K_2^x = K_3^y = K_4^z$ then correct values of $x, y$ and $z$ are respectively
| $H - H$ bond energy | $:\, 431.37 \,kJ\, mol^{-1}$ |
| $C= C$ bond energy | $:\, 606.10\, kJ \,mol^{-1}$ |
| $C - C$ bond energy | $:\, 336.49\, kJ\, mol^{-1}$ |
| $C - H$ bond energy | $:\, 410.50\, kJ\, mol^{-1}$ |
Enthalpy for the reaction,
$\begin{array}{*{20}{c}}
{H\,\,\,\,H} \\
{|\,\,\,\,\,\,\,\,|} \\
{C = C} \\
{|\,\,\,\,\,\,\,\,\,|} \\
{H\,\,\,\,H}
\end{array}\, + \,H - H\, \to \,\begin{array}{*{20}{c}}
{H\,\,\,\,H} \\
{|\,\,\,\,\,\,\,\,|} \\
{H - C - C - H} \\
{|\,\,\,\,\,\,\,\,\,|} \\
{H\,\,\,\,H}
\end{array}\,$
will be .............. $\mathrm{kJ \,mol}^{-1}$