Which oxide formation according to Ellingham diagram shows a graph with sudden change in slope?

1. $\mathrm{CO}_{2}$
2. $\mathrm{Ag}_{2} \mathrm{O}$
3. $\mathrm{Al}_{2} \mathrm{O}_{3}$
4. $\mathrm{Mg} \mathrm{O}$

Asked in: MHT CET 2020 (12 Oct Shift 2)

Practice more General Principles and Processes of Isolation of Metals questions on Aicharya