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 |
54%
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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 |
55%
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Which element's presence is detected through the 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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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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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 |
57%
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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 |
61%
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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 |
65%
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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 |
82%
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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 |
51%
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