The increasing order of stability of the oxidation state is

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Problem

The increasing order of stability of the

+2

oxidation state is (1)

\text{Ca}^{2+}<\text{Ba}^{2+}<\text{Sr}^{2+}

(2)

\text{Pb}^{2+}<\text{Ge}^{2+}<\text{Sn}^{2+}

(3)

\text{Ge}^{2+}<\text{Sn}^{2+}<\text{Pb}^{2+}

(4)

\text{Cu}^{2+}<\text{Au}^{2+}<\text{Ag}^{2+}

Related theory

Oxidation states and oxides
Classification of Elements and Periodicity in Properties
Periodic Trends in Chemical Properties

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