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Concentrated nitric acid is added before proceeding to test for group III members. This is to

(a) Oxidise any remaining $H_2S$
(b) Convert ferrous ions to ferric ions
(c) Form nitrates which gives grannular precipitate
(d) Increase ionisation of ammonium hydroxide

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Answer: Convert ferrous ions to ferric ions
To oxidise ferrous ion into ferric ion otherwise $Fe^{2+}$ is not completely precipitated as $Fe(OH)_2$, as ferrous hydroxide is more soluble in water than $Fe(OH)_3$.
answered Feb 1, 2014 by mosymeow_1

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