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Which one of the following reactions is an example of auto-reduction?A. `Fe_(3)O_(4)+4CO to 3Fe+4CO_(2)`B. `Cu_(2)O+C to 2Cu+ CO `C. `Cu^(2+)(aq)+Fe(s) to Cu(s)+Fe^(2+)(aq)`D. `Cu_(2)O+(1)/(2)Cu_(2)S to 3Cu+(1)/(2)SO_(2)` |
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Answer» Correct Answer - D Auto-reduction is also known as self-reduction . This is used when no external reducing agent is required. The sulphide ores of less electropositive metal like Hg, Pb, Cu etc., are heated in air to convert a part of the ore into oxide or sulphide which then reacts with the remaining sulphide ore to given the metal and sulphur dioxide , e.g., `Cu_(2)O+(1)/(2)Cu_(2)S to 3Cu+(1)/(2)SO_(2)` |
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