In the reactions mentioned below, which one is correctly identified?

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H₂S (g) + Cl₂ (g) → 2 HCl (g) + S (s); H₂S is oxidized and Chloride is reduced.

3Fe₃O₄ (s) + 8 Al (s) → 9 Fe (s) + 4Al₂O₃(s); Aluminium is reduced and Fe₃O₄ is oxidized.

2 Na (s) + H2 (g) → 2 NaH (s); Sodium is reduced and Hydrogen is oxidized.

None of the above.

answer is A.

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Detailed Solution

H₂S is oxidized when it is combined with a more electronegative element, such as chlorine. The addition of hydrogen to chlorine reduces it. When oxygen is added to aluminium, it oxidises. In the second reaction, oxygen has been removed from ferrous ferric oxide (Fe₃O₄), that’s why it has been reduced. Whereas, Sodium is oxidized and hydrogen is reduced in the final reaction.

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