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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 |
68%
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%
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Match the tests in List-I with their corresponding identification in List-II:
1. i → (p), ii → (q), iii → (r), iv → (s)
2. i → (s), ii → (q), iii → (r), iv → (p)
3. i → (s), ii → (q), iii → (p), iv → (r)
4. i → (q), ii → (s), iii → (r), iv → (p)
| List-I (Test) | List-II (Identification) | ||
| (i) | Baeyer’s test | (p) | Aldehyde |
| (ii) | Ceric ammonium nitrate test | (q) | Alcohol |
| (iii) | Phthalein dye test | (r) | Phenol |
| (iv) | Schiff’s test | (s) | Unsaturation |
1. i → (p), ii → (q), iii → (r), iv → (s)
2. i → (s), ii → (q), iii → (r), iv → (p)
3. i → (s), ii → (q), iii → (p), iv → (r)
4. i → (q), ii → (s), iii → (r), iv → (p)
Subtopic: Detection of the functional groups |
71%
Level 2: 60%+
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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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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%
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In the laboratory preparation of chlorine gas by the reaction of hydrochloric acid with manganese dioxide,
What is the role of MnO₂?
1. 6
2. 1
3. 7
4. 8
What is the role of MnO₂?
1. 6
2. 1
3. 7
4. 8
Subtopic: Detection of Anions |
71%
Level 2: 60%+
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Which of the following compounds does not give Tollen’s test?
1. Formaldehyde
2. Formic acid
3. Benzaldehyde
4. Acetone
1. Formaldehyde
2. Formic acid
3. Benzaldehyde
4. Acetone
Subtopic: Detection of the functional groups |
76%
Level 2: 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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A white precipitate was formed when \(\text{BaCl}_2\) was added to water extract of an inorganic salt. Further, a gas 'X' with characteristic odour was released when the formed white precipitate was dissolved in dilute HCl. The anion present in the inorganic salt is:
1. \(\text{I}^-\)
2. \(\text{SO}^{2-}_{3}\)
3. \(\text{S}^{2-}\)
4. \(\text{NO}^{-}_{2}\)
1. \(\text{I}^-\)
2. \(\text{SO}^{2-}_{3}\)
3. \(\text{S}^{2-}\)
4. \(\text{NO}^{-}_{2}\)
59%
Level 3: 35%-60%
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