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The metal oxide which cannot be reduced to metal by carbon is:

1. Al₂O₃
2. PbO
3. ZnO
4. Fe₂O₃

Subtopic: Ellingham Diagram |

Level 3: 35%-60%

NEET - 2013

Hints

Which of the following statements about the advantage of roasting sulphide ore before reduction is not true?

1.	Carbon and hydrogen act as suitable reducing agents for metal sulphides
2.	The \(\Delta_f G^0\) of the sulphide is greater than those for \(C S_2\) and \(\mathrm{H}_2 \mathrm{~S}\)
3.	The \(\Delta_f G^0\) is negative for roasting of sulphur ore to oxide.
4.	Roasting of the sulphide to the oxide is thermodynamically feasible

Subtopic: Ellingham Diagram |

Level 4: Below 35%

AIPMT - 2007

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