MCQ
In which of these processes platinum is used as a catalyst
- ✓Oxidation of ammonia to form $HN{O_3}$
- BHardening of oils
- CProduction of synthetic rubber
- DSynthesis of methanol
$4N{H_3} + 5{O_2}\mathop {\xrightarrow{{Pt}}}\limits_{750\,^oC} 4NO + 6{H_2}O$
$2NO + {O_2} \to 2N{O_2}$
$4N{O_2} + {O_2} + 2{H_2}O \to 4HN{O_3}$
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[Atomic Number: $\mathrm{Fe}=26, \mathrm{Mn}=25, \mathrm{Co}=27$ ]
| List-$I$ | List-$II$ |
| ($P$) $ t_{2 g}^6 e_g^0$ | ($1$)$\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$ |
| ($Q$) $t_{2 g}^3 e_g^2$ | ($2$) $\left[\mathrm{Mn}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$ |
| ($R$) $e^2 t_2^3$ | ($3$)$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}$ |
| ($S$) $t_{2 g}^{+} e_g^2$ | ($4$)$\left[\mathrm{FeCl}_4\right]^{-}$ |
| $\left[\mathrm{CoCl}_4\right]^{2-}$ |