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Problem
Problem
Assertion :
Cu
(
a
q
.
)
+
\text{Cu}_{(aq.)}^+
Cu
(
a
q
.
)
+
is less stable than
Cu
(
a
q
.
)
2
+
\text{Cu}_{(aq.)}^{2+}
Cu
(
a
q
.
)
2
+
but
Fe
(
a
q
.
)
3
+
\text{Fe}_{(aq.)}^{3+}
Fe
(
a
q
.
)
3
+
is more stable than
Fe
(
a
q
.
)
2
+
\text{Fe}_{(aq.)}^{2+}
Fe
(
a
q
.
)
2
+
. Reason : Half filled and completely filled subshells are more stable.
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