Qualitative Analysis of Organic Compounds Recommended PYQs (STRICTLY NCERT Based) Organic Chemistry - Some Basic Principles And Techniques Chemistry NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

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 |

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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

Subtopic: Qualitative Analysis of Organic Compounds |

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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

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The compound that gives blood red colour in Lassaigne's test is:

1.		2.
3.		4.

Subtopic: Qualitative Analysis of Organic Compounds |

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A steam volatile organic compound which is immiscible with water has a boiling point of $250^\circ \text{C}$. During steam distillation, a mixture of this organic compound and water will boil:

1. Above $100^\circ \text{C}$ but below $250^\circ \text{C}$.
2. Above $250^\circ \text{C}$.
3. At $250^\circ \text{C}$.
4. Close to but below $100^\circ \text{C}$.

Subtopic: Qualitative Analysis of Organic Compounds |

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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-} $

Subtopic: Qualitative Analysis of Organic Compounds |

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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

Subtopic: Qualitative Analysis of Organic Compounds |

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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 |

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The Lassaigne’s extract is boiled with conc. ${HNO}_{3}$ while testing for halogens, because it:

1. Helps in the precipitation of $AgCl$
2. Increases the solubility product of $AgCl$
3. Increases the concentration of ${NO}_{3}^{-}$ ions
4. Decomposes ${Na}_{2} S$ and $NaCN$ , if formed

Subtopic: Qualitative Analysis of Organic Compounds | Quantitative Analysis of Organic Compounds |

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