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Q. No.
\(\mathrm{NH}_4 \mathrm{SCN} \) can be used to test:
1. \(\mathrm{Fe}^{3+} \)
2. \(\mathrm{Co}^{2+}, \mathrm{Cu}^{2+}\)
3. \(\mathrm{Fe}^{3+}, \mathrm{Cu}^{2+}\)
4. All of the above
Subtopic: Detection of Cations |
53%
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Copper wire test for halogens is known as:
1. Duma's Test
2. Beilstein's Test
3. Lasssigne's Test
4. Liebg's Test
1. Duma's Test
2. Beilstein's Test
3. Lasssigne's Test
4. Liebg's Test
Subtopic: Detection of Anions |
54%
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Which element's presence is detected through Beilstein test?
1. Sulfur (\(S\))
2. Chlorine (\(Cl\))
3. Carbon (\(C\)) and Hydrogen (\(H\))
4. Nitrogen (\(N\))
1. Sulfur (\(S\))
2. Chlorine (\(Cl\))
3. Carbon (\(C\)) and Hydrogen (\(H\))
4. Nitrogen (\(N\))
Subtopic: Detection of Anions |
75%
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Copper becomes green when exposed to moist air for a long period. This is due to the formation of:
| 1. | A layer of cupric oxide on the surface of copper. |
| 2. | Basic copper sulphate layer on the surface of the metal. |
| 3. | A layer of cupric hydroxide on the surface of copper. |
| 4. | A layer of basic carbonate of copper on the surface of copper. |
Subtopic: Detection of Cations |
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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
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 |
71%
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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 |
56%
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Subtopic: Detection of Cations |
56%
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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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Hints
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 |
64%
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