Qualitative Analysis of Organic Compounds MCQ - Practice Questions & Answers

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On complete combustion, 0.246 g of an organic compound gave 0.198 g of $\mathrm{CO}_2(\mathrm{~g})$ and 0.1014 g of water. The $\%$ of hydrogen in the compound is

3.58%

4.58%

5.58%

6.58%

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Match List-I with List-II -

	List-I (Separation of)		List-II (Separation Technique)
(A)	Aniline from aniline-water mixture	(I)	Simple distillation
(B)	Glycerol from spent-lye in the soap industry	(II)	Fractional distillation
(C)	Different fractions of crude oil in the petroleum industry	(III)	Distillation at reduced pressure
(D)	Chloroform- Aniline mixture	(IV)	Steam distillation

Choose the correct answer from the options given below :

(A)-(IV), (B)-(III), (C)-(II), (D)-(I)

(A)-(I), (B)-(II), (C)-(III), (D)-(IV)

(A)-(III), (B)-(IV), (C)-(I), (D)-(II)

(A)-(II), (B)-(I), (C)-(IV), (D)-(III)

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Concepts Covered - 1

Test for Hydrogen and Carbon

Carbon and hydrogen are detected by heating the compound with copper(II) oxide. Carbon present in the compound is oxidised to carbon dioxide (tested with lime-water, which develops turbidity) and hydrogen to water (tested with anhydrous copper sulphate, which turns blue).

$\\\begin{array}{l}{\mathrm{C}+2 \mathrm{CuO} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{Cu}+\mathrm{CO}_{2}} \\\\ {2 \mathrm{H}+\mathrm{CuO} \stackrel{\Delta}{\longrightarrow} \mathrm{Cu}+\mathrm{H}_{2} \mathrm{O}} \\\\ {\mathrm{CO}_{2}+\mathrm{Ca}(\mathrm{OH})_{2} \longrightarrow \mathrm{CaCO}_{3} \downarrow+\mathrm{H}_{2} \mathrm{O}} \\\\ {5 \mathrm{H}_{2} \mathrm{O}+\mathrm{CuSO}_{4} \longrightarrow \mathrm{CuSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O}}\end{array}$
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