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Q. No.Which indicator is used and what is the color change at the endpoint in oxalic acid-sodium hydroxide titration?
1. Phenolphthalein, pink to yellow
2. Alkaline \(\mathrm{KMnO_4}\), colourless to pink
3. Phenolphthalein, colourless to pink
4. Methyl orange, yellow to pinkish red colour
Subtopic: The chemistry involved in the titrimetric exercises |
53%
Level 3: 35%-60%
NEET - 2024
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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 |
52%
Level 3: 35%-60%
NEET - 2024
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Match List-I with List-II
Choose the correct answer from the options given below:
1. A-III, B-II, C-IV, D-I
2. A-III, B-II, C-I, D-IV
3. A-III, B-IV, C-II, D-I
4. A-III, B-IV, C-I, D-II
| List-I (Ion) |
List-II (Group Number in Cation Analysis) |
||
| A. | \(Co^{2+}\) | I. | Group-I |
| B. | \(Mg^{2+}\) | II. | Group-III |
| C. | \(Pb^{2+}\) | III. | Group-IV |
| D. | \(Al^{3+}\) | IV. | Group-VI |
1. A-III, B-II, C-IV, D-I
2. A-III, B-II, C-I, D-IV
3. A-III, B-IV, C-II, D-I
4. A-III, B-IV, C-I, D-II
Subtopic: Detection of Cations |
Level 3: 35%-60%
NEET - 2025
Please attempt this question first.
Hints
Given below are certain cations. Using inorganic qualitative analysis, arrange them in increasing group number from I to VI.
Choose the correct answer from the options given below
| A. | Al3+ | B. | Cu2+ |
| C. | Ba2+ | D. | Co2+ |
| E. | Mg2+ | ||
| 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 |
51%
Level 3: 35%-60%
NEET - 2024
Hints
Match List-I with List-II:
Choose the correct answer from the options given below:
| (List-I) Solid salt treated with dil. \(\mathrm{{H}_2 {SO}_4}\) |
(List-II ) Anion detected |
||
| A. | Effervescence of colourless gas | I. | \( \mathrm{NO}_2^{-} \) |
| B. | Gas with smell of rotten egg | II. | \(\mathrm{CO}_3^{2-} \) |
| C. | Gas with pungent smell | III. | \(\mathrm{S}^{2-}\) |
| D. | Brown fumes | IV. | \(\mathrm{SO}_3^{2-}\) |
| 1. | A-II, B-III, C-IV, D-I | 2. | A-IV, B-III, C-II, D-I |
| 3. | A-I, B-II, C-III, D-IV | 4. | A-II, B-III, C-I, D-IV |
Subtopic: Detection of Anions |
73%
Level 2: 60%+
NEET - 2024
Hints
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 |
59%
Level 3: 35%-60%
NEET - 2024
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Q. No.
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