- 1(current)
Q. No.Match the reagents from List-I with the corresponding radicals from List-II and choose the correct option:
| List-I (Reagent) | List-II (Radical) | ||
| (i) | \(\text { dil. } \mathrm{HCl}\) | (A) | Pb2+ |
| (ii) | \(\begin{aligned} & \mathrm{NH}_4 \mathrm{Cl}+\mathrm{NH}_4 \mathrm{OH}+ \\ & \left(\mathrm{NH}_4\right)_2 \mathrm{CO}_3 \end{aligned}\) | (B) | Al3+ |
| (iii) | \(\mathrm{NH}_4 \mathrm{Cl}+\mathrm{NH}_4 \mathrm{OH}+\mathrm{H}_2 \mathrm{~S}\) | (C) | Mn2+ |
| (iv) | \(\mathrm{NH}_4 \mathrm{Cl}+\mathrm{NH}_4 \mathrm{OH}\) | (D) | Sr2+ |
| 1. | (i)-(A), (ii)-(D), (iii)-(C), (iv)-(B) |
| 2. | (i)-(D), (ii)-(A), (iii)-(C), (iv)-(B) |
| 3. | (i)-(A), (ii)-(D), (iii)-(B), (iv)-(C) |
| 4. | (i)-(B), (ii)-(C), (iii)-(D), (iv)-(A) |
Subtopic: Detection of Cations |
67%
Level 2: 60%+
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Which of the following cations will turn a borax bead green when heated in a reducing (luminous) flame?
| 1. | \(\mathrm{Fe^{3+}}\) | 2. | \(\mathrm{Cu^{2+}}\) |
| 3. | \(\mathrm{Mn^{2+}}\) | 4. | \(\mathrm{Ni^{2+}}\) |
Subtopic: Detection of Cations |
Level 3: 35%-60%
JEE
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Identify the inorganic sulphides that are yellow in colour:
(A) (NH4)2S
(B) PbS
(C) CuS
(D) As2S3
(E) As2S5
Choose the correct answer from the options given below:
1. (A) and (C) only
2. (A), (D) and (E) only
3. (A) and (B) only
4. (D) and (E) only
(A) (NH4)2S
(B) PbS
(C) CuS
(D) As2S3
(E) As2S5
Choose the correct answer from the options given below:
1. (A) and (C) only
2. (A), (D) and (E) only
3. (A) and (B) only
4. (D) and (E) only
Subtopic: Detection of Cations |
Level 4: Below 35%
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Identify A, B and C in the given below reaction sequence:
1. PbCl2 , PbSO4 , PbCrO4
2. PbS, PbSO4 , PbCrO4
3. PbS, PbSO4 , Pb(CH3COO)2
4. PbCl2 , Pb(SO4)2 , PbCrO4
1. PbCl2 , PbSO4 , PbCrO4
2. PbS, PbSO4 , PbCrO4
3. PbS, PbSO4 , Pb(CH3COO)2
4. PbCl2 , Pb(SO4)2 , PbCrO4
Subtopic: Detection of Cations |
Level 3: 35%-60%
JEE
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When borax is heated with CoO on a platinum loop, blue coloured bead formed is largely due to:
1. \(\mathrm{B}_2 \mathrm{O}_3\)
2. \(\mathrm{Co}\left(\mathrm{BO}_2\right)_2\)
3. \(\mathrm{CoB}_4 \mathrm{O}_7\)
4. \(\mathrm{Co}\left[\mathrm{B}_4 \mathrm{O}_5(\mathrm{OH})_4\right]\)
1. \(\mathrm{B}_2 \mathrm{O}_3\)
2. \(\mathrm{Co}\left(\mathrm{BO}_2\right)_2\)
3. \(\mathrm{CoB}_4 \mathrm{O}_7\)
4. \(\mathrm{Co}\left[\mathrm{B}_4 \mathrm{O}_5(\mathrm{OH})_4\right]\)
Subtopic: Detection of Cations |
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Please attempt this question first.
Match List-I with List-II:
Choose the most appropriate answer from the options given below:
1. (a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
2. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
3. (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
4. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
| List-I (Metal Ion) |
List-II (Group in Qualitative analysis) |
||
| (a) | \(Mn^{2+}\) | (i) | Group-III |
| (b) | \(As^{3+}\) | (ii) | Group-IIA |
| (c) | \(Cu^{2+}\) | (iii) | Group-IV |
| (d) | \(Al^{3+}\) | (iv) | Group-IIB |
Choose the most appropriate answer from the options given below:
1. (a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
2. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
3. (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
4. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
Subtopic: Detection of Cations |
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The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet colour in a non-luminous flame under hot conditions in the borax bead test is:
1. \(\mathrm{Ti}^{3+}\)
2. \(\mathrm{Ni}^{2+}\)
3. \(\mathrm{Mn}^{2+}\)
4. \(\mathrm{Cr}^{3+}\)
1. \(\mathrm{Ti}^{3+}\)
2. \(\mathrm{Ni}^{2+}\)
3. \(\mathrm{Mn}^{2+}\)
4. \(\mathrm{Cr}^{3+}\)
Subtopic: Detection of Cations |
Level 4: Below 35%
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Consider the following ions:
\(\mathrm{Cu}^{2+}, \mathrm{Fe}^{3+}, \mathrm{Ba}^{2+}, \mathrm{Ca}^{2+}, \mathrm{NH}_4^{+}, \mathrm{Mg}^{2+}, \mathrm{Zn}^{2+}\)
Among the following cations, the number of cations that will give a characteristic precipitate in their identification tests with \(\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]\) is/are:
\(\mathrm{Cu}^{2+}, \mathrm{Fe}^{3+}, \mathrm{Ba}^{2+}, \mathrm{Ca}^{2+}, \mathrm{NH}_4^{+}, \mathrm{Mg}^{2+}, \mathrm{Zn}^{2+}\)
Among the following cations, the number of cations that will give a characteristic precipitate in their identification tests with \(\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]\) is/are:
| 1. | Zero (0) | 2. | Three (3) |
| 3. | Two (2) | 4. | Four (4) |
Subtopic: Detection of Cations | The chemistry involved in the titrimetric exercises |
Level 4: Below 35%
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- 1(current)
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