In Ellingham diagrams, +ve slope is observed for: (1) \( \mathrm{Cu} \rightarrow \mathrm{C}_{2} ...

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In Ellingham diagrams, +ve slope is observed for:
(1) \( \mathrm{Cu} \rightarrow \mathrm{C}_{2} \mathrm{O} \)
(2) \( \mathrm{C} \rightarrow \mathrm{CO} \)
(3) \( \mathrm{Al} \rightarrow \mathrm{Al}_{2} \mathrm{O}_{3} \)
(4) Both (1) and (3)
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