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Find number of basic radicals among the following cations, which can form soluble complex on adding excess of \( \mathrm{NH}_{3} \) solution :
\[
\begin{array}{l}
\mathrm{Cd}^{2+}(a q .), \mathrm{Pb}^{2+}(a q .), \mathrm{Ni}^{2+}(a q .), \mathrm{Mn}^{2+}(a q .), \mathrm{Zn}^{2+}(a q .), \mathrm{Ag}^{+}(a q .), \mathrm{Hg}^{2+}(a q .), \mathrm{Fe}^{3+}(a q .) \\
\mathrm{Mg}^{2+}(a q .)
\end{array}
\]
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