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Ag(2)O and HgO are unstable at moderate ...

`Ag_(2)O` and HgO are unstable at moderate temprature and they will decompose on heating even in the absence of reducing agent .Why?

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Ellingham diagram for the formation of `Ag_(2)O` and HgO is at upper part of the diagram and their decomposition tempratures are 600 and 700 K respectively .It indicates that these oxides are unstable at moderate tempratures and will decompose on heating even in the absence of a reducing agent.
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