Q. No.BaCl2 solution gives a white precipitate with a solution of a salt, which dissolves in dilute hydrochloric acid with the evolution of colourless, pungent smelling gas. The gas as well as the salt, both, are used as bleaching agent in textile companies. The salt contains:
1. Sulphite
2. Sulphide
3. Acetate
4. Carbonate
Subtopic: Detection of Anions |
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Chocolate brown precipitate is formed with :
1. \(Cu^{2+}\) ions and \([Fe(CN)_6]^{3-}\)
2. \(Cu^{2+}\) ions and \([Fe(CN)_6]^{4-}\)
3. \(Fe^{2+}\) ions and \([Fe(CN)_6]^{4-}\)
4. \(Fe^{2+}\) ions and dimethylglyoxime
1. \(Cu^{2+}\) ions and \([Fe(CN)_6]^{3-}\)
2. \(Cu^{2+}\) ions and \([Fe(CN)_6]^{4-}\)
3. \(Fe^{2+}\) ions and \([Fe(CN)_6]^{4-}\)
4. \(Fe^{2+}\) ions and dimethylglyoxime
Subtopic: Detection of Cations |
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Pink colour of acidified \(KMnO_4\) is decolourised but there is no evolution of any gas. This may happen with the compound containing the following acid radical (s):
| 1. | \(SO^{2-}_3\) | 2. | \(NO^{-}_2\) |
| 3. | \(S^{2-}\) | 4. | All of the above |
Subtopic: Detection of Anions |
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Subtopic: Detection of Cations |
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Which of the following statement is incorrect?
1. \(Fe^{2+}\) ions give a dark blue precipitate with potassium hexacyanidoferrate (III) solution.
2. \(Fe^{3+}\) ions give intense blue precipitate with potassium hexacyanidoferrate (II) solution.
3. \(Fe^{3+}\) ions give a brown colouration with potassium hexacyanidoferrate (III) solution.
4. \(Fe^{2+}\) ions give a deep red colouration with ammonium thiocyanate.
1. \(Fe^{2+}\) ions give a dark blue precipitate with potassium hexacyanidoferrate (III) solution.
2. \(Fe^{3+}\) ions give intense blue precipitate with potassium hexacyanidoferrate (II) solution.
3. \(Fe^{3+}\) ions give a brown colouration with potassium hexacyanidoferrate (III) solution.
4. \(Fe^{2+}\) ions give a deep red colouration with ammonium thiocyanate.
Subtopic: Detection of Cations |
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Which of the following pairs of ions would be expected to form a precipitate when dilute solutions are mixed?
(a) \(\mathrm{NH}_4{ }^+,\left[\mathrm{Co}\left(\mathrm{NO}_2\right)_6\right]^{3-}\)
(b) \(\mathrm{NH}_4{ }^{+}, \mathrm{CO}_3{ }^{2-} \)
(c) \(\mathrm{Fe}^{3 +}, \mathrm{OH}^{-} \)
(d) \(\mathrm{Ba}^{2+}, \mathrm{SO}_4^{2-}\)
1. (a), (b),(c)
2. (a), (c), (d)
3. (a), (b)
4. None of the above
(a) \(\mathrm{NH}_4{ }^+,\left[\mathrm{Co}\left(\mathrm{NO}_2\right)_6\right]^{3-}\)
(b) \(\mathrm{NH}_4{ }^{+}, \mathrm{CO}_3{ }^{2-} \)
(c) \(\mathrm{Fe}^{3 +}, \mathrm{OH}^{-} \)
(d) \(\mathrm{Ba}^{2+}, \mathrm{SO}_4^{2-}\)
1. (a), (b),(c)
2. (a), (c), (d)
3. (a), (b)
4. None of the above
Subtopic: Detection of Cations |
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Salt (A) on heating gives a colourless neutral gas that supports combustion. It can be concluded, based on the diagram given above that compound (A) contains the acid radical:
1. \(\mathrm{NO}_2^{-} \)
2. \(\mathrm{NO}_3^{-} \)
3. \(\mathrm{Br}^ - \)
4. \(\mathrm{SO}_3{ }^{2-}\)
Subtopic: Detection of Anions |
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Salt (A) on heating gives a colourless neutral gas that supports combustion. It can be concluded, based on the diagram given above that the correct statement(s) among the following is/are:
1. Salt (A) gives a yellow precipitate with chloroplatinic acid as well as with sodium cobaltinitrite.
2. The brown ring is formed due to the formation of nitroso ferrous sulphate \([\mathrm{Fe}(\mathrm{NO})]^{2+} \mathrm{SO}_4^{-}\)
3. Salt ‘C’ reacts with silver nitrate solution to form a white precipitate.
4. (A) and (B) both.
Subtopic: Detection of Anions |
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Which of the following gives foul-smelling gas with the smell of rotten eggs with dil. \(H_2SO_4\)?
1. \(CO^{2-}_3\)
2. \(SO^{2-}_3\)
3. \(S^{2-}\)
4. \(NO^-_2\)
1. \(CO^{2-}_3\)
2. \(SO^{2-}_3\)
3. \(S^{2-}\)
4. \(NO^-_2\)
Subtopic: Detection of Anions |
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Subtopic: Detection of Anions |
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