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Q. No.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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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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Salt (A), when heated, releases a colorless neutral gas that supports combustion. Based on the diagram provided, it can be concluded that compound (A) contains the following acid radical:
| 1. | \(\mathrm{NO}_2^{-} \) | 2. | \(\mathrm{NO}_3^{-} \) |
| 3. | \(\mathrm{Br}^ - \) | 4. | \(\mathrm{SO}_3{ }^{2-}\) |
Subtopic: Detection of Anions |
58%
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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 |
63%
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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 |
83%
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Subtopic: Detection of Anions |
86%
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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. \(NO^{-}_2\)
(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:
1. Chromous chloride
2. Chromyl chloride
3. Chromic chloride
4. Chromic sulphate
The chemical name of red vapour is:
1. Chromous chloride
2. Chromyl chloride
3. Chromic chloride
4. Chromic sulphate
Subtopic: Detection of Cations |
92%
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An aqueous solution contains the ions as \(Hg^{2+}_2 , Hg^{2+}, Pb^{2+}~ \text {and} ~Cd^{2+}\). The addition of dilute HCl precipitates:
1. \(Hg_2Cl_2 \) only
2. \(PbCl_2\) only
3. \(PbCl_2\) and \(HgCl\)
4. \(HgCl_2\) and \(PbCl_2\)
1. \(Hg_2Cl_2 \) only
2. \(PbCl_2\) only
3. \(PbCl_2\) and \(HgCl\)
4. \(HgCl_2\) and \(PbCl_2\)
Subtopic: Detection of Cations |
59%
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