- 1(current)
Q. No.Match the anion radicals given in List I with the corresponding characteristics in List II and select the correct option given below:
Codes:
1. A-III, B-I, C-II, D-IV
2. A-II, B-I, C-IV, D-III
3. A-IV, B-I, C-III, D-II
4. A-IV, B-I, C-II, D-III
| List-I (Anions) | List-II (Gas evolved on reaction with dil H2SO4) |
||
| A. | \(\mathrm{CO}_3^{2-}\) | I. | Colourless gas that turns lead acetate paper black. |
| B. | \(\mathrm{S}^{2-}\) | II. | Colourless gas that turns acidified potassium dichromate solution green. |
| C. | \(\mathrm{SO}_3^{2-}\) | III. | Brown fumes that turn acidified \(\mathrm{KI}\) solution containing starch blue. |
| D. | \(\mathrm{NO}_2^{-}\) | IV. | Colourless gas evolved with brisk effervescence, which turns lime water milky. |
1. A-III, B-I, C-II, D-IV
2. A-II, B-I, C-IV, D-III
3. A-IV, B-I, C-III, D-II
4. A-IV, B-I, C-II, D-III
Subtopic: Detection of Anions |
79%
Level 2: 60%+
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Hints
Find the oxidation state of molybdenum in the yellow precipitate (compound X) formed when phosphorus is tested using ammonium molybdate.
1. Six (6)
2. One (1)
3. Seven (7)
4. Eight (8)
1. Six (6)
2. One (1)
3. Seven (7)
4. Eight (8)
Subtopic: Detection of Anions |
53%
Level 3: 35%-60%
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Which of the following statements is incorrect with respect to the nitrate ion test?
| 1. | A dark brown ring is formed at the junction of two solutions. |
| 2. | Ring is formed due to nitroso ferrous sulphate complex. |
| 3. | The brown complex is \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_5(\mathrm{NO})\right]{\mathrm{SO}_4}\) |
| 4. | Heating the nitrate salt with conc. \(\text{H}_2\text{SO}_4,\) light brown fumes are evolved. |
Subtopic: Detection of Anions |
Level 3: 35%-60%
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Hints
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Consider the sulphides \(HgS,PbS,CuS, Sb_2S_3,As_2S_3\) and \(CdS.\). Number of these sulphides soluble in \(50\% ~HNO_3\) is :
1. 0
2. 4
3. 2
4. 5
1. 0
2. 4
3. 2
4. 5
Subtopic: Detection of Anions |
51%
Level 3: 35%-60%
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Hints
- 1(current)
Q. No.
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