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Q. No.Given below are certain cations. Using inorganic qualitative analysis, arrange them in increasing group number from I to VI.
A. Al3+
B. Cu2+
C. Ba2+
D. Co2+
E. Mg2+
Choose the correct answer from the options given below
1. B, C, A, D, E
2. E, C, D, B, A
3. E, A, B, C, D
4. B, A, D, C, E
A. Al3+
B. Cu2+
C. Ba2+
D. Co2+
E. Mg2+
Choose the correct answer from the options given below
1. B, C, A, D, E
2. E, C, D, B, A
3. E, A, B, C, D
4. B, A, D, C, E
Subtopic: Detection of Cations |
52%
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During the preparation of Mohr's salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of Fe2+ ion?
1. Concentrated sulphuric acid
2. Dilute nitric acid
3. Dilute sulphuric acid
4. Dilute hydrochloric acid
1. Concentrated sulphuric acid
2. Dilute nitric acid
3. Dilute sulphuric acid
4. Dilute hydrochloric acid
Subtopic: Preparation of the Organic and Inorganic compounds |
53%
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In salt analysis, group V radicals \(\mathrm{(Ba^{2+}, Ca^{2+} ~and ~Sr^{2+} )}\) are precipitated as their carbonates by adding solid \(\mathrm{NH_4Cl}\) and excess of \(\mathrm{NH_4OH}\) solution followed by solid \(\mathrm{(NH_4)_2CO_3}\)
Choose the correct reagent used for the confirmation of \(\mathrm{Ca^{2+}}\) ion from the following:
Choose the correct reagent used for the confirmation of \(\mathrm{Ca^{2+}}\) ion from the following:
| 1. | Ammonium sulphate | 2. | Potassium chromate |
| 3. | Ammonium oxalate | 4. | Ammonium nitrate |
Subtopic: Detection of Cations |
55%
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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: Detection of Anions |
60%
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What specific indication suggests the presence of an aldehyde group when reacting with 2,4-Dinitrophenylhydrazine (DNPH)?
1. Formation of a silver mirror
2. Formation of a yellow-orange precipitate
3. Liberation of gas with effervescence
4. No observable reaction
1. Formation of a silver mirror
2. Formation of a yellow-orange precipitate
3. Liberation of gas with effervescence
4. No observable reaction
Subtopic: Detection of the functional groups |
81%
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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: Detection of Anions |
56%
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What is the product when NaBr and concentrated H2SO4 are heated together?
1. HOBr
2. HBr
3. \(Br_2\)
4. \(HBrO_3\)
1. HOBr
2. HBr
3. \(Br_2\)
4. \(HBrO_3\)
Subtopic: Detection of Anions |
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Brown ppt (A) dissolves in \(HNO_3\), gives (B) which in turn gives white ppt (C) with \(NH_4OH\). (C) on reaction with HCl gives solution (D), which gives white turbidity on addition of water. What is (D)?
1. \(Ca(OH)_2\)
2. \(Bi(OH)_3\)
3. BiOCl
4. \(Bi(NO_3)_3\)
1. \(Ca(OH)_2\)
2. \(Bi(OH)_3\)
3. BiOCl
4. \(Bi(NO_3)_3\)
Subtopic: Detection of Cations |
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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: Detection of Anions |
69%
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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: Detection of Anions |
58%
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