Potassium permanganate on heating gives potassium manganate,oxygen and $X$. For which of the following reactions,$X$ is used as a catalyst?
- A$2 KClO_3 \xrightarrow{\Delta} 2 KCl + 3 O_2$
- B$2 SO_2 + O_2 \longrightarrow 2 SO_3$
- C$4 HCl + O_2 \longrightarrow 2 Cl_2 + 2 H_2 O$
- D$4 NH_3 + 5 O_2 \longrightarrow 4 NO + 6 H_2 O$
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