Assertion : $F e {S O}_{4}$ and ${F e}_{2} {({S O}_{4})}_{3}$ undergo intramolecular redox reaction on thermal decomposition. Reason: Both salts give brown solid of ${F e}_{2} O_{3}$ after decomposition.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
The thermal decomposition of $F e S O_{4}$ gives $F e_{2} O_{3}$ . This is an intermolecular redox reaction.
$2 F e S O_{4} \to F e_{2} O_{3} + S O_{2} + S O_{3}$
The thermal decomposition of $F e_{2} (S O_{4})_{3}$ gives $F e_{2} O_{3}$ . This is an intramolecular redox reaction.
$F e_{2} (S O_{4})_{3} \to F e_{2} O_{3} + 3 S O_{3}$
Ferric oxide is a red powder.

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