
Interpretation: The element being oxidized and reduced on decomposing copper (II) oxide to copper and oxygen should be determined.
Concept Introduction: The oxidation state is defined as the charge(s) that an atom would have when electron(s) were transferred completely from a molecule or ion.
The element being oxidized is the one whose oxidation increases in the reaction whereas the reduced element is the one whose oxidation number decreases in the reaction.

Answer to Problem 2E
On decomposing copper (II) oxide to copper and oxygen, the oxygen undergoes oxidation and copper undergoes reduction.
Explanation of Solution
The balanced
While determining the oxidation state of compound, the element with greater electronegativity is assigned with negative value of oxidation state which is equal to the charge as an anion in ionic compounds and element whose oxidation states are fixed are assigned. For compounds with no charge, the sum of oxidation states is zero.
The oxidation states are determined as:
Since,
The oxidation state of
Since,
so:
So, the oxidation for each element in the reaction is:
Since, the oxidation state of
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