Name the substance which remains in a test tube after heating ferrous sulphate.

F e_{2} O_{3}

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F e_{2} S

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F e_{2} (S O_{4})_{3}

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None of these

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Solution

The correct option is D $F e_{2} O_{3}$
Heating farrow sulfate in a test tube following reaction takes place
$F e S O_{4} .7 H_{2} O \to F e S O_{4} + 7 H_{2} O$
$2 F e S O_{4} \to F e_{2} O_{3} + S O_{2} + S O_{3}$
Both $S O_{2}$ and $S O_{3}$ are gases that colorless and evolved out
Only $F e_{2} O_{3}$ that is ferric oxide which reddish brown in colour remained in the fort tube ,so the answer is $F e_{2} O_{3}$ that is ferric oxide

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