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Q. No.Given below are two statements:
| Assertion (A): | Magnesium metal is not used for the reduction of alumina in the metallurgy of aluminum |
| Reason (R): | Magnesium can reduce alumina. But the process will be uneconomical. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Subtopic: Â Ellingham Diagram |
 64%
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The reduction of a metal oxide is easier if the metal formed is in a liquid state at the temperature of reduction because-
| 1. | Entropy is higher if the metal is in a liquid state than when it is in solid-state |
| 2. | Entropy is lower if the metal is in a liquid state than when it is in solid-state |
| 3. | Equilibrium constant value is low metal formed in a liquid state |
| 4. | None of the above |
Subtopic: Â Metallurgy of individual elements |
 81%
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Among zinc and iron scraps, the scraps more suitable for reducing the leached copper ore.
1. Zinc is more suitable
2. Iron is more suitable
3. Zinc and iron both have equal probability
4. Cannot predict
Subtopic: Â Metallurgy of individual elements |
 56%
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Q. No.
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