A) \[S+{{O}_{2}}\xrightarrow{{}}S{{O}_{2}}\]
B) \[C+{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}\]
C) \[2S{{O}_{2}}+{{O}_{2}}\xrightarrow{{}}2S{{O}_{3}}\]
D) All of the above
Correct Answer: C
Solution :
Reaction (a) and (b) are exothermic and spontaneous so do not need catalyst. On the other hand, conversion of\[S{{O}_{2}}\]into\[S{{O}_{3}}\]need catalyst. Catalyst used for this reaction may be\[Pt\]or\[{{V}_{2}}{{O}_{5}}\](contact process) or\[NO\](lead chamber process) \[2S{{O}_{2}}+{{O}_{2}}\xrightarrow{{{V}_{2}}{{O}_{5}}}2S{{O}_{3}}\]
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