In Ellingham diagram, which two metals oxide have very low decomposition temperature

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In the Ellingham diagram, oxides with very low decomposition temperatures are the least stable oxides* and have relatively positive values of ΔG° of formation.

HgO decomposes easily on heating:

$2 H g O \to 2 H g + O_{2}$

Ag₂O also decomposes at a low temperature:

$2 A g_{2} O \to 4 A g + O_{2}$

Al₂O₃ and MgO are highly stable oxides with very negative ΔG° values and require extremely high temperatures for decomposition.

Answer - (A) HgO and (B) Ag₂O

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