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Conc. $\mathrm{HNO}_3$ is added before proceeding to test for group III members. This is to
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Convert ferrous ion into ferric ion
$\mathrm{HNO}_3$ oxidises $\mathrm{Fe}^{2+}$ to $\mathrm{Fe}^{3+}$ otherwise $\mathrm{Fe}^{2+}$ is not completely precipitated as hydroxide.
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