Identify the compound $F$ .

S O_{2}

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S O_{3}

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F e_{2} O_{3}

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None of the above

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Solution

The correct option is A $S O_{2}$
Reactions:
$3 S O_{2} + C r_{2} O_{7}^{2 -} + 2 H^{+} ⟶ 3 S O_{4}^{2 -} + 2 C r^{3 +} + H_{2} O$
$(o r a n g e)$ $(g r e e n c o l o u r)$
$F e S O_{4} .7 H_{2} O g e n t l e h e a t - ----- \to F e S O_{4} + 7 H_{2} O N O - - \to F e [(H_{2} O)_{5} N O] S O_{4}$
A B C D $(b r o w n c o l o u r)$
$F e S O_{4} h e a t - - \to F e_{2} O_{3} + S O_{2} + S O_{3}$
E F G
$(b r o w n r e s i d u e)$

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