Question

Of the following pairs of ions which one is not an iso-electronic pair?

Options

• \[\ce{Fe^2+, Mn^2+}\]

• \[\ce{O^2-, F-}\]

• \[\ce{Na+, Mg^2+}\]

• \[\ce{Mn^2+, Fe^3+}\]

Answer 1

\[\ce{Fe^2+, Mn^2+}\]