Chapter 22

Which of the following compounds is violet in colour? (a) \(\mathrm{Na}_{4}\left[\mathrm{Fe}(\mathrm{CN}), \mathrm{NSO}_{3}\right]_{3}\) (b) \(\mathrm{Na}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6} \mathrm{NSO}\right]_{2}\) (c) \(\mathrm{Na}_{2}\left[\mathrm{Fe}(\mathrm{CN})_{5} \mathrm{NSO}\right]_{3}\) (d) \(\mathrm{Na}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{5} \mathrm{NOS}\right]\)

An organic compound on heating with CuO produces \(\mathrm{CO}_{2}\) but not water. It may be (a) \(\mathrm{CH}_{4}\) (b) \(\mathrm{CCl}_{4}\) (c) \(\mathrm{CHCl}_{3}\) (d) \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{I}\)

The empirical formula of a compound is \(\mathrm{CH}_{2}\), One mole of the compound has a mass of \(42 \mathrm{~g}\). Its molecular formula is (a) \(\mathrm{C}_{j} \mathrm{H}_{6}\) (b) \(\mathrm{C}_{3} \mathrm{H}_{\mathrm{s}}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{2}\) (d) \(\mathrm{CH}_{2}\)

\(60 \mathrm{~g}\) of a compound on analysis produced \(24 \mathrm{~g}\) carbon, \(4 \mathrm{~g}\) hydrogen and \(32 \mathrm{~g}\) oxygen. The empirical formula of the compound is (a) \(\mathrm{CH}_{4} \mathrm{O}\) (b) \(\mathrm{CH}_{2} \mathrm{O}_{2}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}_{2}\) (d) \(\mathrm{CH}_{2} \mathrm{O}\)

Mark the incorrect statement in Kjeldahl's method of estimation of nitrogen (a) copper sulphate or mercury acts as a catalyst (b) nitrogen is quantitatively decomposed to give ammonium sulphate (c) nitrogen gas is collected over caustic potash solution (d) potassium sulphate is used as boiling point elevator of \(\mathrm{H}_{2} \mathrm{SO}_{4}\)

An organic compound is found to have the formula \(\mathrm{C}_{5} \mathrm{H}_{10} \mathrm{ONCl}\). The percentage of nitrogen present in it is (a) \(23.36 \%\) (b) \(10.3 \%\) (c) \(41.05 \%\) (d) \(5.06 \%\)

\(500 \mathrm{~mL}\) of a hydrocarbon gas burnt in excess of oxygen, gave \(2500 \mathrm{~mL}\) of \(\mathrm{CO}_{2}\) and \(3000 \mathrm{~mL}\) of water vapour (at constant T and P). The formula of the hydrocarbon is (a) \(\mathrm{C}_{3} \mathrm{H}_{6}\) (b) \(\mathrm{C}_{2} \mathrm{H}_{4}\) (c) \(\mathrm{C}_{s} \mathrm{H}_{12}\) (d) \(\mathrm{CH}_{4}\)

The empirical formula of a compound is \(\mathrm{CH}_{2}\). One mole of the compound has a mass of \(42 \mathrm{~g}\), its molecular formula is (a) \(\mathrm{C}_{2} \mathrm{H}_{2}\) (b) \(\mathrm{C}_{2} \mathrm{H}_{4}\) (c) \(\mathrm{C}_{3} \mathrm{H}_{\mathrm{g}}\) (d) \(\mathrm{C}_{4} \mathrm{H}_{\mathrm{s}}\)

Which of the following statements is wrong? (a) in the estimation of carbon, an organic compound is heated with \(\mathrm{CaO}\) in a combustion tube. (b) using Lassaigne's test nitrogen and sulphur present in an organic compound can be tested. (c) using Beilstein's test the presence of halogen in a compound can be tested (d) Lassaigne's tests fails to identify nitrogen in diazo compound.

A mixture contains four solid organic compounds (A), (B), (C) and (D), On heating, only (C) changes from solid to vapour state. The compound (C) can be separated from the mixture by (a) sublimation (b) crystallization (c) distillation (d) fractional distillation

\(0.24 \mathrm{~g}\) of a volatile liquid on vaporization gives \(45 \mathrm{~mL}\) of vapours at STP. What will be the vapour density of the substance? (Density of \(\mathrm{H}_{2}=0.089 \mathrm{gL}^{-4}\) ) (a) \(99.39\) (b) \(39.95\) (c) \(95.53\) (d) \(59.93\)

If a compound on analysis was found to contain \(\mathrm{C}=\) \(18.5 \%, \mathrm{H}=1.55 \%, \mathrm{Cl}=55.04 \%\) and \(\mathrm{O}=24.81 \%\) then its empirical formula is (a) \(\mathrm{CHClO}\) (b) \(\mathrm{CH}_{2} \mathrm{ClO}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OCl}\) (d) \(\mathrm{ClC}_{2} \mathrm{H}_{5} \mathrm{O}\)

A compound with empirical formula \(\mathrm{CH}_{2} \mathrm{O}\) has a vapour density of \(30 .\) Its molecular formula is (a) \(\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O}_{3}\) (b) \(\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}_{2}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{2} \mathrm{O}_{2}\) (d) \(\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}\)

The identity of two different solid organic compounds having the same melting point can be best ascertained by determining their (a) dipole moment (b) solubility (c) melting point of their \(1: 1\) mixture (d) refractive indices

\(0.5 \mathrm{~g}\) of an organic compound in Kjeldahl experiment needs \(29 \mathrm{ml}\) of \(\frac{\mathrm{N}}{5} \mathrm{H}_{2} \mathrm{SO}_{4}\) for complete neutralisation of \(\mathrm{NH}_{3} .\) The \(\mathrm{N} \%\) is? (a) \(16.2\) (b) \(8.1\) (c) \(24.3\) (d) \(32.4\)

When \(0.25 \mathrm{~g}\) of an organic compounds is heated with \(\mathrm{HNO}_{3}\) and \(\mathrm{AgNO}_{3}\) in a carius tube, it gives \(0.35 \mathrm{~g}\) of silver chloride. The percentage of chlorine in the compound is (a) \(36.6 \%\) (b) \(45.3 \%\) (c) \(34.6 \%\) (d) \(54.8 \%\)

If \(0.1 \mathrm{~g}\) of an organic compound containing phosphorus gave \(0.222 \mathrm{~g}\) of \(\mathrm{Mg}_{2} \mathrm{P}_{2} \mathrm{O}_{7}\), then the percentage of phosphorus in the compound is (a) 31 (b) \(0.2\) (c) 66 (d) 62

The empirical formula of a compound is \(\mathrm{CH}_{2} \mathrm{O}\). If \(0.0832\) mole of the compound contains \(1.0 \mathrm{~g}\) of hydrogen, then the molecular formula of the compound is (a) \(\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}\) (b) \(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\) (c) \(\mathrm{C}_{3} \mathrm{H}_{10} \mathrm{O}_{5}\) (d) \(\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O}_{3}\)

\(5.0 \mathrm{~g}\) of a certain metal, \(\mathrm{X}\) (atomic mass \(=27\) ) is converted into \(61.7 \%\) crystalline sulphate containing \(48.6 \%\) by mass of water of crystallization. The simplest formula of the compound is (a) \(\mathrm{X}_{2}\left(\mathrm{SO}_{4}\right)_{3}-18 \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{X}_{2}\left(\mathrm{SO}_{4}\right)_{3} \cdot 14 \mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{X}_{2}\left(\mathrm{SO}_{4}\right)_{3} \cdot 16 \mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{X}_{2}\left(\mathrm{SO}_{4}\right)_{3} \cdot 12 \mathrm{H}_{2} \mathrm{O}\)

If \(0.2\) gram of an organic compound containing carbon, hydrogen and oxygen, on combustion, yielded \(0.147\) gram carbon dioxide and \(0.12\) gram water. What will be the content of oxygen in the substance? (a) \(73.29 \%\) (b) \(68.45 \%\) (c) \(85.23 \%\) (d) \(89.50 \%\)

Using Victor Meyer's method, \(0.2 \mathrm{~g}\) of an organic substance displaced \(56 \mathrm{~mL}\) of air at STP. The molecular weight of the compound is (a) 112 (b) 56 (c) 80 (d) 28

What is the molecular formula of a compound, whose empirical formula is \(\mathrm{CH}_{2} \mathrm{O}\) and molecular weight is 90 ? (a) \(\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}_{2}\) (b) \(\mathrm{C}_{6} \mathrm{H}_{6} \mathrm{O}_{3}\) (c) \(\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O}_{3}\) (d) \(\mathrm{C}_{4} \mathrm{H}_{3} \mathrm{O}_{4}\)

An organic compound has \(\mathrm{C}\) and \(\mathrm{H}\) percentage in the ratio \(6: 1\) and \(\mathrm{C} \%\) and \(\mathrm{O} \%\) in the ratio \(3: 4\). The compound is (a) \(\mathrm{HCHO}\) (b) \(\mathrm{CH}_{3} \mathrm{OH}\) (c) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}\) (d) \((\mathrm{COOH})_{2}\)

A complex compound of cobalt with the composition \(\mathrm{Co}=22.58 \%, \mathrm{H}=5.79 \%, \mathrm{~N}=32.2 \%, \mathrm{O}=12.20 \%\) and \(\mathrm{Cl}=27.17 \%\) on heating, looses ammonia to the extent of \(32.63 \%\) of its mass. The number of molecules of ammonia present in one molecule of the cobalt complex is (At. mass of \(\mathrm{Co}=58.9\) ) (a) 7 (b) 5 (c) 8 (d) 12

In the enzyme peroxidase anhydrase the percentage of selenium (Se) by mass is \(0.5 \%\). If atomic mass of Se is \(78.4 \mathrm{U}\), then minimum molecular mass of peroxidase anhydrase enzyme is (a) \(1.568 \times 10^{3} \mathrm{U}\) (b) \(1.568 \times 10^{4} \mathrm{U}\) (c) \(1.568 \mathrm{U}\) (d) \(2.136 \times 10^{4} \mathrm{U}\)

A gaseous hydrocarbon has \(85 \%\) carbon and vapour density of 28 . The possible formula of the hydrocarbon will be (a) \(\mathrm{C}_{4} \mathrm{H}_{\mathrm{g}}\) (b) \(\mathrm{C}_{2} \mathrm{H}_{4}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{2}\) (d) \(\mathrm{C}_{3} \mathrm{H}_{6}\)

An organic compound contains \(49.3 \%\) carbon, \(6.84 \%\) hydrogen and its vapour density is 73. Molecular formula of the compound is (a) \(\mathrm{C}_{3} \mathrm{H}_{10} \mathrm{O}_{2}\) (b) \(\mathrm{C}_{3} \mathrm{H}_{5} \mathrm{O}_{2}\) (c) \(\mathrm{C}_{6} \mathrm{H}_{10} \mathrm{O}_{3}^{-}\) (d) \(\mathrm{C}_{4} \mathrm{H}_{10} \mathrm{O}_{2}\)

An organic compound has \(\mathrm{C}\) and \(\mathrm{H}\) percentage in the ratio \(6: 1\) and \(\mathrm{C}\) and \(\mathrm{O}\) percentage in the \(3: 4\). The compound is (a) \((\mathrm{COOH})_{2}\) (b) \(\mathrm{CH}_{3} \mathrm{OH}\) (c) HCHO (d) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}\)

An organic compound containing carbon, hydrogen and oxygen contains \(52.2 \%\) carbon and \(13.04 \%\) hydrogen. Vapour density of the compound is 23 . Its molecular formula will be (a) \(\mathrm{C}_{4} \mathrm{H}_{\mathrm{g}} \mathrm{O}\) (b) \(\mathrm{C}_{3} \mathrm{H}_{\mathrm{s}} \mathrm{O}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}\) (d) \(\mathrm{C}_{4} \mathrm{H}_{10} \mathrm{O}\)

\(9.9 \mathrm{~g}\) of an amide with molecular formula \(\mathrm{C}_{4} \mathrm{H}_{5} \mathrm{~N}_{\mathrm{x}} \mathrm{O}_{\mathrm{z}}\) on heating with alkali liberated \(1.7 \mathrm{~g}\) of ammonia. If the percentage of oxygen is \(32.33 \%\), then the ratio of \(\mathrm{N}\) and \(\mathrm{O}\) atoms in the compound is (a) \(2: 1\) (b) \(1: 2\) (c) \(2: 5\) (d) \(2: 3\)

On combustion, \(0.2 \mathrm{~g}\) of an organic compound containing carbon, hydrogen and oxygen yields \(0.147 \mathrm{~g}\) carbon dioxide and \(0.12 \mathrm{~g}\) water. The percentage of carbon, hydrogen and oxygen respectively in the compound is (a) \(22.5,8.7\) and \(68.8\) (b) \(20,6.7\) and \(73.3\) (c) \(18.2,9.5\) and \(72.3\) (d) \(28.9,12.8\) and \(58.8\)

Which of the following pair of compounds can be separated by using fractional distillation (a) Acetone and methyl alcohol (b) Benzene and toluene (c) Ethyl alcohol \((95.5 \%)\) and water \((4.5 \%)\) (d) Crude petroleum (gasoline and kerosene)

Which of the following compounds can be distilled by using steam Distillation? (a) Aniline (b) O-hydroxyphenol (c) O-Hydroxy bezaldehyde (d) Glyeerol

Select the correct statements regarding Lassaigne's test? (a) Li and \(\mathrm{K}\) are not used in this test (b) \(\mathrm{NH}_{4} \mathrm{Cl}, \mathrm{NH}_{2}-\mathrm{NH}_{2}\) Can't be detected by this test. (c) Urea, Acetamide can not give this test. (d) Benzamide, Azobenzene can give this test.

In the detection of 'N' by Lassaigne's test which of the following compounds are formed during this test? (a) \(\mathrm{Fe}(\mathrm{OH})_{2}\) (b) \(\mathrm{Na}_{4}\left[\mathrm{Fc}(\mathrm{CN})_{6}\right]\) (c) \(\mathrm{FeCl}_{3}\) (d) \(\mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}\)

Kjeldohl's method can not be used to detect \(96 \%\) of \(\mathrm{N}\) in which of these compounds? (a) Pyridine (b) Pyrole (c) Aniline (d) Diazo compounds

Match the following \begin{tabular}{ll} \hline Column-I (Method used for detections) & Column-II (Element detections) \\\ \hline (a) Liebig's method & (p) Carbon \\ (b) Duma's method & (q) Nitrogen \\ (c) Carius method & (r) Sulphur \\ \begin{tabular}{ll} (d) Kjeldahl's method & (s) Hydrogen \\ & (t) Halogen \\ \hline \end{tabular} \end{tabular}

How many of the following elements can be tested by using Lassaigne's Test. \(\mathrm{N}, \mathrm{S}, \mathrm{Cl}, \mathrm{Br}, \mathrm{I}, \mathrm{O}, \mathrm{C}, \mathrm{P}, \mathrm{H}\)

An organic compound contains \(58.52 \% \mathrm{C}, 4.08 \% \mathrm{H}\), and \(11.38 \% \mathrm{~N}\) by mass. The cmpirical formula of the compound is \(\mathrm{C}_{6} \mathrm{H}_{y} \mathrm{~N}_{2} \mathrm{O}\), the value \(\mathrm{Y}\) is

In an organic compound of molar mass \(108 \mathrm{~g} \mathrm{~mol}^{-1} \mathrm{C}\), \(\mathrm{H}\) and \(\mathrm{N}\) atoms are present in \(9: 1: 3.5\) by weight. The molecular formula of the compound can be [2002] (a) \(\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{~N}_{2}\) (b) \(\mathrm{C}_{6} \mathrm{H}_{\mathrm{s}} \mathrm{N}_{2}\) (c) \(\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{~N}_{3}\) (d) \(\mathrm{C}_{4} \mathrm{H}_{12} \mathrm{~N}_{2}\)

Bottles containing \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{I}\) and \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{2} \mathrm{I}\) lost their original labels. They were labeled \(\mathrm{A}\) and \(\mathrm{B}\) for testing. A and B were separately taken in test tubes and boiled with \(\mathrm{NaOH}\) solution. The end solution in each tube was made acidic with dilute \(\mathrm{HNO}_{3}\) and some \(\mathrm{AgNO}_{3}\) solution added. Solution B gave a yellow precipitate. Which one of the following statements is true for the experiment? (a) A was \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{2} \mathrm{I}\) (b) A was \(\mathrm{C}_{6} \mathrm{H}_{3} \mathrm{I}\) (c) \(\mathrm{B}\) was \(\mathrm{C}_{6} \mathrm{H}_{3} \mathrm{I}\) (d) addition of \(\mathrm{HNO}_{3}\) was unnecessary

The ammonia evolved from the treatment of \(0.30 \mathrm{~g}\) of an organic compound for the estimation of nitrogen was passed in \(100 \mathrm{~mL}\) of \(0.1 \mathrm{M}\) sulphuric acid. The excess of acid required \(20 \mathrm{~mL}\) of \(0.5 \mathrm{M}\) sodium hydroxide solution for complete neutralization. The organic compound is (a) benzamide (b) acetamide (c) thiourea (d) urea

The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is |2004| (a) \(\mathrm{Fe}(\mathrm{CN})_{3}\) (b) \(\mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}\) (c) \(\mathrm{Na}_{4}[\mathrm{Fe}(\mathrm{CN}), \mathrm{NOS}]\) (d) \(\mathrm{Na}_{1}[\mathrm{Fe}(\mathrm{CN})]\)

An organic compound having molecular mass 60 is found to contain \(\mathrm{C}=20 \%, \mathrm{H}=6.67 \%\) and \(\mathrm{N}=\) \(46.67 \%\) while rest is oxygen. On heating, it gives \(\mathrm{NH}_{3}\) along with a solid residue. The solid residue give violet colour with alkaline copper sulphate solution. The compound is (a) \(\mathrm{CH}_{3} \mathrm{CONH}_{2}\) (b) \(\mathrm{CH}_{3} \mathrm{NCO}\) (c) \(\left(\mathrm{NH}_{2}\right)_{2} \mathrm{CO}\) (d) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CONH}_{2}\)

\(29.5 \mathrm{mg}\) of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved amomnia was absorbed in \(20 \mathrm{~mL}\) of \(0.1 \mathrm{M}\) HCl solution. The excess of the acid required \(15 \mathrm{~mL}\) of \(0.1 \mathrm{M} \mathrm{NaOH}\) solution for complete neutralization. The percentage of nitrogen in the compound is (a) \(59.0\) (b) \(47.4\) (c) \(23.7\) (d) \(29.5\)

For the estimation of nitrogen, \(1.4 \mathrm{~g}\) of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in \(60 \mathrm{~mL}\) of \(\frac{\mathrm{M}}{10}\) sulphuric acid. The unreacted acid required \(20 \mathrm{~mL}\) of \(\frac{\mathrm{M}}{10}\) sodium hydroxide for complete neutralizaton. The percentage of nitrogen in the compound is: [2014] (a) \(3 \%\) (b) \(5 \%\) (c) \(6 \%\) (d) \(10 \%\)

In Carius method of estimation of halogens, \(250 \mathrm{mg}\) of an organic compound gave \(141 \mathrm{mg}\) of \(\mathrm{AgBr}\). The percentage of bromine in the compound is (At. mass \(\mathrm{Ag}=108 ; \mathrm{Br}=80)\) (a) \(24 \%\) (b) \(36 \%\) (c) \(48 \%\) (d) \(60 \%\)

Glycerol can be separated from spent bye by using \(|2016|\) (a) Steam Distillation (b) Vaccum Distillation (c) Fractional Distillation (d) Distillation under Reduced Pressure