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Potassium permanganate on heating gives potassium manganate, oxygen and $\mathrm{X}$. For which of the following reactions, $\mathrm{X}$ is used as a catalyst.

Chemistryd and f Block ElementsAP EAMCETAP EAMCET 2017 (26 Apr Shift 2)

Options:

A $2 \mathrm{KClO}_3 \underset{\Delta}{\longrightarrow} 2 \mathrm{KCl}+3 \mathrm{O}_2$
B $2 \mathrm{SO}_2+\mathrm{O}_2 \longrightarrow 2 \mathrm{SO}_3$
C $4 \mathrm{HCl}+\mathrm{O}_2 \longrightarrow 2 \mathrm{Cl}_2+2 \mathrm{H}_2 \mathrm{O}$
D $4 \mathrm{NH}_3+5 \mathrm{O}_2 \longrightarrow 4 \mathrm{NO}+6 \mathrm{H}_2 \mathrm{O}$

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