Which of the following gives $S O_{3}$ on heating?

H_{2} S O_{4} + S

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C u_{2} S O_{4} + C

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F e S O_{4}

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H_{2} S O_{4} + P C l_{3}

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Solution

The correct option is C $F e S O_{4}$

When ferrous sulfate ( $F e S O_{4}$ ) is heated , $S O_{2}, S O_{3}, F e_{2} O_{3}$ are formed

The following reaction takes place

$2 F e S O_{4} .7 H_{2} O \to F e_{2} O_{3} + S O_{2} + S O_{3}$ .
$S O_{2}, S O_{3}$ evolves as gases, the remaining residue is the solid - $F e_{2} O_{3}$ (ferric oxide) - which is a reddish brown powder.
Hence option C is correct.

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