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Q. No.Consider the given set of reactions and choose the correct option:
\(PbCl_2 + K_2CrO_4 \rightarrow A + KCl \)
\(\begin{aligned} & \mathrm{A}+\underset{(\text { excess })}{\mathrm{NaOH}} \rightarrow \mathrm{~B}+\mathrm{Na}_2 \mathrm{CrO}_4 \\ & \mathrm{PbSO}_4+\mathrm{CH}_3 \mathrm{COONH}_4 \rightarrow \mathrm{C}+\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4 \end{aligned}\)
Find A, B, C.
1. \(\mathrm {A : PbCrO_4}\); \(\mathrm {B : PbO_2 }\); \(\mathrm {C : Pb(OH)_2 }\)
2. \(\mathrm {A : PbCrO_4}\); \(\mathrm {B : Na_2[Pb (OH)_4]}\); \(\mathrm{C}: \mathrm{Pb}\left(\mathrm{CH}_3 \mathrm{COO}\right)_2\)
3. \(\text { A : } \mathrm{PbCrO}_4\); \(\mathrm{B}: \mathrm{PbO}\); \(\mathrm{C}:\left[\mathrm{Pb}\left(\mathrm{NH}_3\right)_4\right]^{2+} \)
4. \(\mathrm{A}: \mathrm{PbO}_2\); \(\mathrm{B}: \mathrm{Pb}(\mathrm{OH})_2\); \(\mathrm{C}:\left[\mathrm{Pb}\left(\mathrm{CH}_3 \mathrm{COO}\right)_4\right]^{2-}\)
\(PbCl_2 + K_2CrO_4 \rightarrow A + KCl \)
\(\begin{aligned} & \mathrm{A}+\underset{(\text { excess })}{\mathrm{NaOH}} \rightarrow \mathrm{~B}+\mathrm{Na}_2 \mathrm{CrO}_4 \\ & \mathrm{PbSO}_4+\mathrm{CH}_3 \mathrm{COONH}_4 \rightarrow \mathrm{C}+\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4 \end{aligned}\)
Find A, B, C.
1. \(\mathrm {A : PbCrO_4}\); \(\mathrm {B : PbO_2 }\); \(\mathrm {C : Pb(OH)_2 }\)
2. \(\mathrm {A : PbCrO_4}\); \(\mathrm {B : Na_2[Pb (OH)_4]}\); \(\mathrm{C}: \mathrm{Pb}\left(\mathrm{CH}_3 \mathrm{COO}\right)_2\)
3. \(\text { A : } \mathrm{PbCrO}_4\); \(\mathrm{B}: \mathrm{PbO}\); \(\mathrm{C}:\left[\mathrm{Pb}\left(\mathrm{NH}_3\right)_4\right]^{2+} \)
4. \(\mathrm{A}: \mathrm{PbO}_2\); \(\mathrm{B}: \mathrm{Pb}(\mathrm{OH})_2\); \(\mathrm{C}:\left[\mathrm{Pb}\left(\mathrm{CH}_3 \mathrm{COO}\right)_4\right]^{2-}\)
Subtopic: Detection of Cations |
Level 4: Below 35%
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Hints
In qualitative analysis, \(Ba^{2+}\) and \(Ca^{2+}\) ions give characteristic confirmatory tests with which of the following reagents, respectively?
1. Chromate, Sulphate
2. Sulphite, Sulphate
3. Hydroxide, Carbonate
4. Carbonate, Carbonate
1. Chromate, Sulphate
2. Sulphite, Sulphate
3. Hydroxide, Carbonate
4. Carbonate, Carbonate
Subtopic: Detection of Cations |
Level 4: Below 35%
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Hints
Which of the following statements are correct ?
(A) Hydrated salt can be primary standard.
(B) Primary standard should not react with air.
(C) Primary standard should react instantaneously and stoichiometrically.
(D) Primary standard should not be water soluble.
(E) Primary standard should not be of lower mass.
Choose the correct option:
1. A. B, C, E
2. C, D, E
3. A, B, E
4. A, B, C
(A) Hydrated salt can be primary standard.
(B) Primary standard should not react with air.
(C) Primary standard should react instantaneously and stoichiometrically.
(D) Primary standard should not be water soluble.
(E) Primary standard should not be of lower mass.
Choose the correct option:
1. A. B, C, E
2. C, D, E
3. A, B, E
4. A, B, C
Subtopic: Preparation of the Organic and Inorganic compounds | The chemistry involved in the titrimetric exercises | Chemical principles involved in the experiments |
Level 3: 35%-60%
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Preparation of potassium permanganate from MnO2 involves a two step process in which the 1st step is a reaction with KOH and KNO3 to produce:
1. \(\mathrm{K}_4\left[\mathrm{Mn}(\mathrm{OH})_6\right]\)
2. \(\mathrm{K}_3 \mathrm{MnO}_4\)
3. \(\mathrm{KMnO}_4\)
4. \(\mathrm{K}_2 \mathrm{MnO}_4\)
1. \(\mathrm{K}_4\left[\mathrm{Mn}(\mathrm{OH})_6\right]\)
2. \(\mathrm{K}_3 \mathrm{MnO}_4\)
3. \(\mathrm{KMnO}_4\)
4. \(\mathrm{K}_2 \mathrm{MnO}_4\)
Subtopic: Detection of extra elements | Preparation of the Organic and Inorganic compounds |
68%
Level 2: 60%+
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Hints
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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Hints
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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Hints
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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Hints
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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Hints
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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Hints
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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