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JAMB - Chemistry (1979 - No. 40)

On heating anhydrous iron (ll) sulphate, in addition to producing iron (iii) oxide, which of the following is produced?
SO2 (g) + FeS (s)
SO3 (g) +FeS(s)
SO2 (g) + SO3(g)
SO2 (g) + H2S (g)
SO3(g) + H2S(g)

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