Q. No.During Lassaigne's test, the elements present in an organic compound are converted from:
| 1. | Covalent form to covalent form |
| 2. | Ionic form to ionic form |
| 3. | Covalent form to ionic form |
| 4. | Ionic form to covalent form |
Subtopic: Qualitative Analysis of Organic Compounds |
71%
Level 2: 60%+
NEET - 2026
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Which one of the following reactions does not belong to "Lassaigne's test"?
| 1. | \(\mathrm{Na}+\mathrm{X} \underset{\Delta}{\longrightarrow}+\mathrm{NaX} \) |
| 2. | \(2 \mathrm{CuO}+\mathrm{C} \xrightarrow[\Delta]{} 2 \mathrm{Cu}+\mathrm{CO}_2 \) |
| 3. | \(\mathrm{Na}+\mathrm{C}+\mathrm{N} \xrightarrow[\Delta]{} \mathrm{NaCN} \) |
| 4. | \(2 \mathrm{Na}+\mathrm{S} \xrightarrow[\Delta]{} \mathrm{Na}_2 \mathrm{~S}\) |
Subtopic: Qualitative Analysis of Organic Compounds |
68%
Level 2: 60%+
NEET - 2025
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On heating, some solid substances change from solid to vapour state without passing through liquid state. The technique used for the purification of such solid substances based on the above principle is known as:
| 1. | Sublimation | 2. | Distillation |
| 3. | Chromatography | 4. | Crystallization |
Subtopic: Qualitative Analysis of Organic Compounds |
82%
Level 1: 80%+
NEET - 2024
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The method used for quantitative estimation of halogens is:
1. Dumas method
2. Carius method
3. Kjeldahl's method
4. Combustion method
1. Dumas method
2. Carius method
3. Kjeldahl's method
4. Combustion method
Subtopic: Qualitative Analysis of Organic Compounds |
70%
Level 2: 60%+
NEET - 2024
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The technique used to purify liquids having high boiling points and getting decomposed at or below their boiling points is:
1. Fractional distillation
2. Steam distillation
3. Simple distillation
4. Distillation under reduced pressure
1. Fractional distillation
2. Steam distillation
3. Simple distillation
4. Distillation under reduced pressure
Subtopic: Qualitative Analysis of Organic Compounds |
61%
Level 2: 60%+
NEET - 2024
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Subtopic: Qualitative Analysis of Organic Compounds |
74%
Level 2: 60%+
NEET - 2024
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An organic compound that is immiscible with water and undergoes steam distillation has a normal boiling point of 250 °C. At what temperature does the mixture of this compound and water distill during steam distillation?
1. Above 100 °C but significantly below 250 °C2. Above 250 °C
3. At 250 °C
4. Slightly below 100 °C
Subtopic: Qualitative Analysis of Organic Compounds |
Level 4: Below 35%
NEET - 2024
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In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with \(\text{Fe}^{3+}\) due to the formation of:
1. \([\mathrm{Fe}(\mathrm{SCN})]^{2+} \)
2. \(\mathrm{Fe}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]_3 \cdot \mathrm{xH}_2 \mathrm{O} \)
3. \(\mathrm{NaSCN} \)
4. \(\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NOS}\right]^{4-} \)
1. \([\mathrm{Fe}(\mathrm{SCN})]^{2+} \)
2. \(\mathrm{Fe}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]_3 \cdot \mathrm{xH}_2 \mathrm{O} \)
3. \(\mathrm{NaSCN} \)
4. \(\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NOS}\right]^{4-} \)
Subtopic: Qualitative Analysis of Organic Compounds |
67%
Level 2: 60%+
NEET - 2023
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The most suitable method used for the separation of 1:1 mixture of ortho and para-nitrophenols is:
1. Chromatography
2. Crystallization
3. Steam distillation
4. Sublimation
1. Chromatography
2. Crystallization
3. Steam distillation
4. Sublimation
Subtopic: Qualitative Analysis of Organic Compounds |
80%
Level 1: 80%+
NEET - 2017
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In Kjeldahl’s method for estimation of nitrogen present in the soil sample, ammonia evolved from 0.75g of sample neutralized 10ml of 1M H2SO4. The percentage of nitrogen in the soil is:
| 1. | 37.33 | 2. | 45.85 |
| 3. | 25.75 | 4. | 43.13 |
Subtopic: Qualitative Analysis of Organic Compounds |
73%
Level 2: 60%+
AIPMT - 2014
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