A substance on treatment with dil. \(H_2SO_4\) liberates a colourless gas that produces
(i) turbidity with baryta water
(ii) turns acidified dichromate solution green
The reaction indicates the presence of:
1. \(CO^{2-}_3\)
2. \(S^{2-}\)
3. \(SO^{2-}_3\)
4. \(NO^{-}_2\)
Subtopic: Detection of Anions |
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When a mixture of solid NaCl, solid \(K_2Cr_2O_7\) is heated with conc. \(H_2SO_4\), orange red vapours are obtained.
The chemical name of red vapour is:
The brown ring test for NO3- is enabled due to the formation of the complex ion with the formula:
1. \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} \)
2. \(\mathrm{Fe}\left[\mathrm{NO}(\mathrm{CN})_5\right]^{2-} \)
3. \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{NO}\right]^{2+} \)
4. \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)(\mathrm{NO})_5\right]^{2+} \)
Subtopic: Detection of Anions |
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