Answer to Question #53305 in Inorganic Chemistry for manisha
During the catalytic process a catalyst is changed, but is not consumed and its amount remains constant. Contrary the reagent reacts therefore its concentration becomes less than that at the start of reaction.
O2 + 2SO2 → 2SO3. This reaction doesn’t occur at normal condition (very low rate), however if we add NO2, it is carried out very fast.
Thus, SO2 and O2 are reagents because they are transformed into SO3.
Regarding NO2 we should consider its catalytic cycle:
2NO2 + 2SO2 → 2SO3 + 2NO
2NO + O2 → 2NO2
As shown NO2 participates in the reaction but it is not consumed making reaction faster. It means that this is a catalyst.
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NO2 takes part in reaction to form products but in general its concentration (or amount) remains the same in the end of the reaction.
I did not understand second reaction that you give. as you said NO2 is using as catalyst in it .if it is catalyst then why it take part in reaction to form products.