Q. No.In salt analyses, \(\mathrm{Cl^-,Br^-}\) and \(\mathrm{I^-}\) are identified by adding dilute \(\mathrm{HNO_3}\) followed by \(\mathrm{AgNO_3}\) solution to the salt solution.
Which of the following statements are correct?
Choose the correct answer from the options given below:
Which of the following statements are correct?
| A. | \(\mathrm{Cl^-}\) gives pale yellow precipitate. |
| B. | \(\mathrm{Br^-}\) gives pale yellow precipitate which is partially soluble in \(\mathrm{NH_4OH.}\) |
| C. | \(\mathrm{I^-}\) gives yellow precipitate which is insoluble in \(\mathrm{NH_4OH.}\) |
| D. | \(\mathrm{Cl^-}\) gives white precipitate which is insoluble in \(\mathrm{NH_4OH.}\) |
| E. | \(\mathrm{I^-}\) gives purple violet gas. |
| 1. | B and C only | 2. | A and B only |
| 3. | A and E only | 4. | D and E only |
Subtopic: Â Detection of Anions |
 59%
Level 3: 35%-60%
NEET - 2024
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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: Â Detection of Anions |
 55%
Level 3: 35%-60%
Hints
What is the product when NaBr and concentrated H2SO4 are heated together?
| 1. | HOBr | 2. | HBr |
| 3. | \(Br_2\) | 4. | \(HBrO_3\) |
Subtopic: Â Detection of Anions |
Level 3: 35%-60%
Hints
A salt gives effervescence on heating with conc. \(\mathrm{H}_2 \mathrm{SO}_4.\) MnO2 and a light greenish-yellow pungent gas is also evolved.
This indicates the ions present in the salt are:
1. \(\mathrm{I^{-}ions.} \)
2. \(\mathrm{Br^{-}ions.} \)
3. \(\mathrm{Cl^{-}ions.} \)
4. \(\mathrm{S^{2-}ions.} \)
This indicates the ions present in the salt are:
1. \(\mathrm{I^{-}ions.} \)
2. \(\mathrm{Br^{-}ions.} \)
3. \(\mathrm{Cl^{-}ions.} \)
4. \(\mathrm{S^{2-}ions.} \)
Subtopic: Â Detection of Anions |
 68%
Level 2: 60%+
Hints
What reagents are added to the test solution to detect phosphate ions?
| 1. | Concentrated \(\mathrm{H_2SO_4 }\) and ammonium molybdate solution |
| 2. | Concentrated \(\mathrm{HCl}\) and ammonium sulfate solution |
| 3. | Concentrated \(\mathrm{HNO_3}\) and ammonium molybdate solution |
| 4. | Concentrated \(\mathrm{H_3PO_4}\) and ammonium chloride solution |
Subtopic: Â Detection of Anions |
 58%
Level 3: 35%-60%
Hints
Which of the following gases has a pungent smell similar to burning sulphur?
| 1. | Oxygen | 2. | Nitrogen |
| 3. | Carbon dioxide | 4. | Sulphur dioxide |
Subtopic: Â Detection of Anions |
 85%
Level 1: 80%+
Hints
Match List-I with List-II:
Choose the correct answer from the options given below:
1. A-II, B-III, C-IV, D-I
2. A-IV, B-III, C-II, D-I
3. A-I, B-II, C-III, D-IV
4. A-II, B-III, C-I, D-IV
| (List-I) Solid salt treated with dil. \(\mathrm{{H}_2 {SO}_4}\) |
(List-II ) Anion detected |
||
| A. | Effervescence of colourless gas | I. | \( \mathrm{NO}_2^{-} \) |
| B. | Gas with smell of rotten egg | II. | \(\mathrm{CO}_3^{2-} \) |
| C. | Gas with pungent smell | III. | \(\mathrm{S}^{2-}\) |
| D. | Brown fumes | IV. | \(\mathrm{SO}_3^{2-}\) |
1. A-II, B-III, C-IV, D-I
2. A-IV, B-III, C-II, D-I
3. A-I, B-II, C-III, D-IV
4. A-II, B-III, C-I, D-IV
Subtopic: Â Detection of Anions |
 73%
Level 2: 60%+
NEET - 2024
Hints
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: Â Detection of Anions |
 75%
Level 2: 60%+
Hints
Which element among the following is used to enhance the intensity of \(\mathrm{NO}_2 \) gas?
1. Copper (\(\mathrm{Cu}\))
2. Hydrogen (\(\mathrm{H}\))
3. Neon (\(\mathrm {Ne}\))
4. Manganese (\(\mathrm{Mn}\))
1. Copper (\(\mathrm{Cu}\))
2. Hydrogen (\(\mathrm{H}\))
3. Neon (\(\mathrm {Ne}\))
4. Manganese (\(\mathrm{Mn}\))
Subtopic: Â Detection of Anions |
 68%
Level 2: 60%+
Hints
In the brown ring complex \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{NO}^{+}\right] \mathrm{SO}_4\), what is the oxidation number of iron (\(\mathrm{Fe}\))?
1. +1
2. +2
3. +3
4. -1
1. +1
2. +2
3. +3
4. -1
Subtopic: Â Detection of Anions |
 76%
Level 2: 60%+
Hints
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