How many statements are correct? (i) Like \( \mathrm{CO}_{3}^{2-}, \mathrm{SO}_{3}^{2-} \) also ...
0How many statements are correct?
(i) Like \( \mathrm{CO}_{3}^{2-}, \mathrm{SO}_{3}^{2-} \) also gives test with lime water.
(ii) In the test of \( \mathrm{NO}_{3}^{-} \), brown ring is formed due to the formation of \( \left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5} \mathrm{NO}\right]^{2+} \).
(iii) Aqueous solution of \( \mathrm{Ag}^{+} \)ions gives brick red/red precipitate with \( \mathrm{K}_{2} \mathrm{CrO}_{4} \).
(iv) Lead salts turn black on prolonged exposure in a chemical laboratory.
(v) In analysis of group \( \mathrm{II}^{\text {nd }} \) cations, \( \mathrm{H}_{2} \mathrm{~S} \) gas is passed in presence of hydrochloric acid to enhance the concentration of \( \mathrm{S}^{2-} \) ions.
(vi) Aqueous solution of \( \mathrm{Cu}^{2+} \) ions forms a green complex with \( \mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \).
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