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

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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_(2)S`
B. Convert ferrous ions to ferric ions
C. form nitrates which gives grannular precipitate
D. increases ionisation of ammonium hydroxide
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To oxidise ferrous ion into ferrice ion otherwise `Fe^(2+)` is not completely precipitated as `Fe(OH)_(2)` , as ferrous hydroxide is more soluble in water than `Fe(OH)_(3)`.
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