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  • Conc. is added before proceeding to test for group III basic radicals. This is done t

Conc. \mathrm{HNO}_{3} is added before proceeding to test for group III basic radicals. This is done to

Option: 1

Oxidise any remaining \mathrm{H}_{2} \mathrm{S}


Option: 2

Convert Ferrous ions into Ferric ions


Option: 3

Form nitrates which give granular precipitates


Option: 4

Increase ionisation of ammonium hydroxide


Answers (1)

best_answer

\mathrm{HNO}_{3} oxidises \text{Fe}^{2+} \text{ to Fe}^{3+} otherwise \text{Fe}^{2+}is not completely precipitated as hydroxide.

Hence, the correct answer is Option (2)

Posted by

vishal kumar

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