A mixture is known to contain \( \mathrm{NO}_{3}^{-} \)and \( \mathrm{NO}_{2}^{-} \). Before per...

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A mixture is known to contain \( \mathrm{NO}_{3}^{-} \)and \( \mathrm{NO}_{2}^{-} \). Before performing ring test for \( \mathrm{NO}_{3}^{-} \), the aqueous solution should be made free of \( \mathrm{NO}_{2}^{-} \). This is done by heating aqueous extract with:
(a) Conc. \( \mathrm{HNO}_{3} \)
(b) dil. \( \mathrm{HNO}_{3} \)
(c) Urea
(d) Zinc dust
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