Which of the following is not a correct statement?

For the reaction

${\mathrm{NH}}_4^{+}+{\mathrm{S}}^{-2}\rightleftharpoons {\mathrm{NH}}_3+{\mathrm{HS}}^{-}$
${\mathrm{NH}}_3 \mathrm{and} {\mathrm{S}}^{-2}$ are a group of:

For the reaction,

${\mathrm{CH}}_4\left(\mathrm{g}\right)+2{\mathrm{O}}_2\left(\mathrm{g}\right)\rightleftharpoons {\mathrm{CO}}_2\left(\mathrm{g}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right);$ ${\mathrm{\Delta }}_{\mathrm{r}}\mathrm{H}=-170.8 \mathrm{kJ} {\mathrm{mol}}^{-1}$.

Which of the following statements is not true?