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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Names of organic compounds are under the latest guide line of IUPAC IUPAC means international union of pure and applied chemistry. The main rules are longest chain rule, lowest number rule etc. We have to include the rules for naming the substituetns, multiple bonds and even functional groups. Write the IUPAC name of the following compound A. 3,3-Diethenyl pentane 1,5-dinitrileB. 3, ethyenyl,3-ethyl pentane 1,5-dinirileC. 3,3-diethenyl pentane 1,5-dicyanideD. None of these |
| Answer» Correct Answer - A | |
| 52. |
The colour of the solution/precipitate obtained in the elemental analysis of an organic compound and the molecule/ion responsible for the colour are given below. Choose the incorrectly matched pair:A. Prussian blue - `Fe_(4)[Fe(CN)_(6)]_(3).xH_(2)O`B. Black - PbSC. Violet colour - `[Fe(CN)_(5)NOS]^(4-)`D. Yellow - `(NH_(4))_(2)MoO_(4)` |
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Answer» Correct Answer - D During the detection of P, the yellow ppt. obtained are due to `(NH_(4))_(3)PO_(4).12 MoO_(3)` (amm. Phosphomolybdate) and not due to `(NH_(4))_(2)MoO_(4)` (ammonium molybdate). Thus, option (e) is incorrect. |
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| 53. |
Most acidic species among the following isA. `CH_(3)-overset(O)overset(||)(C)-CH_(3)`B. `CH_(3)-O-H`C. `CH_(3)-C-=C-H`D. |
| Answer» Correct Answer - B | |
| 54. |
Correct order of acidic strength for the given speciesA. `CH_(3)-C-=overset(o+)(N)-H`B. `CH_(3)-CH_(2)-CH_(3)`C. `CH_(3)-C-=C-H`D. |
| Answer» Correct Answer - D | |
| 55. |
Compare acidic strength of A. `IIgtIgtIIIgtIV`B. `IVgtIIgtIgtIII`C. `IIIgtIVgtIIgtI`D. `IIgtIVgtIgtIII` |
| Answer» Correct Answer - B | |
| 56. |
The systematic name of `C_(17)H_(35)COOH` isA. Heptadecanoic acidB. Octadecanoic acidC. Steric acidD. Plamitic acid. |
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Answer» Correct Answer - B The systematic name of `C_(17)H_(35)COOH` is heptandecanoic acid. |
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| 57. |
Which of the following organic molecule can not form hydrogen bond in pure state but can form the same in water?A. `(CH_(3)CH_(2))_(2)NH`B. `CH_(3)CHO`C. `CH_(3)CH_(2)COOH`D. `CH_(2)overset(O)overset(||)(C)-NH_(2)` |
| Answer» Correct Answer - B | |
| 58. |
Most acidic species among the following isA. B. C. D. |
| Answer» Correct Answer - B | |
| 59. |
What is the index of hydrogen deficiencyd in the molecule `C_(12)H_(17)NO`?A. 4B. 5C. 6D. 7 |
| Answer» Correct Answer - B | |
| 60. |
The number and type of bonds between two carbon atoms in calcium carbide areA. One sigma, one piB. One sigma, two piC. Two sigma, one piD. Two sigma, two pi. |
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Answer» Correct Answer - B Structure of calcium carbide is `overset(2+)Ca(overset(-)Cequivoverset(-)C).` The two carbon atoms are bonded with each other through a triple bond. So, one sigma and two `pi` bonds between them. |
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| 61. |
Which of the following compound will exhibit cis-trans isomerism?A. But-`2`-eneB. PropeneC. But-`1`-eneD. Benzene |
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Answer» Correct Answer - A Follow conditions of geometrical isomerism. |
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| 62. |
Which of the following not show cis-trans isomerism?A. `CH_(3)-underset(CH_(3))underset(|)(C)=CH-CH_(2)-CH_(3)`B. `CH_(3)-underset(CH_(3))underset(|)(CH)-CH=CH-CH_(2)-CH_(3)`C. `CH_(3)-CH=CH-CH_(3)`D. `CH_(3)-CH_(2)-CH=CH-CH_(2)-CH_(3)` |
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Answer» Correct Answer - A Does not follow conditions of geometrical isomerism. |
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| 63. |
Which of the following will not show cis-trans isomerism?A. Butanedioic acidB. `1,2`-dimethyl cyclopropaneC. `1,2`-dichloroetheneD. Butanedioic acid |
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Answer» Correct Answer - A Butanedioic acid. |
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| 64. |
The `IUPAC` name of `CH_(3)-overset(O)overset(||)(C)-CH_(2)-overset(OH)overset(|)(CH)-CHO` isA. 5-oxo-4-hydroxypenta-2-oneB. 4-Hydroxy-5-al-2pentaneC. 2-Hydroxy-4-oxopentanalD. 1-al-4-oxo-pentan-2-al |
| Answer» Correct Answer - C | |
| 65. |
The `IUPAC` name of tert-butyl chloride isA. 4-ChlorobutaneB. 2-ChlorobutaneC. 1-Chloro-3-methylpropaneD. 2-Chloro-2-methylpropane |
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Answer» Correct Answer - D `underset("2-Chloro-2-methylpropane")underset()(CH_(3)-overset(1CH_(3))overset(2|)underset(CH_(3))underset(3|)C-Cl)` |
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| 66. |
The IUPAC name of the compound A. 3-methyl-56-ethylcyclohexeneB. 6-ethyl-3-methyl cyclohexeneC. 3-ethyl-6-methyl cyclohexeneD. 6-methyl-3-ethyl cyclohexene |
| Answer» Correct Answer - C | |
| 67. |
The IUPAC name of tertiary butyl chloride isA. 4-ChlorobutaneB. 2-ChlorobutaneC. 1-Chloro-3-methyl propaneD. 2-Chloro-2-methyl propane |
| Answer» Correct Answer - D | |
| 68. |
IUPAC name of `CH_(2)=CH-CH (CH_(3)CH_(2))underset(Br)underset(|)(C)=CH_(2)` is :A. 4-Bromo-3-ethyl-1, 4-pentadieneB. 2-Bromo-3-ethyl-1, 4-pentadieneC. 2-Bromo-3-ethyl-1, 5-pentadieneD. none of these |
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Answer» Correct Answer - B `{:(" "Br),(" |"),(overset(5)(C)H_(2)=overset(4)(C)H-overset(3)(C)H-overset(2)(C=)overset(1)(C)H_(2)),(" |"),(" "CH_(2)CH_(3)):}` 2-Bromo-3-ethyl-1, 4-pentadiene. |
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| 69. |
`CH_(3)-underset(Cl-C-Br)underset(||)C-Cl` isA. transB. `Z`C. both correctD. none of these |
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Answer» Correct Answer - B `CH_(3)-underset("Z Form")underset(Cl-C-Br)underset(||)(C)-Cl` |
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| 70. |
Which of the following compound has wrong IUPAC name?A. `CH_(3)CH_(2)-CH_(2)COO-CH_(2)CH_(3)underset(("Ethyl butanoate"))`B. `CH_(3)-underset(CH_(3))underset(|)CH-CH_(2)-CHO("3-Methylbutanal")`C. `CH_(3)-underset(OH)underset(|)CH-underset(CH_(3))underset(|)CH-CH_(3) ("2-Methyl-3-butanal")`D. `underset(("2-Methyl-3-pentanone"))underset()(CH_(3)-underset(CH_(3))underset(|)CH-underset(O)underset(||)C-CH_(2)-CH_(3))` |
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Answer» Correct Answer - C `underset("3-Methylbutan-2-01")underset()(overset(1)CH_(3)-overset(2)underset(OH)underset(|)(CH)-overset(3)underset(CH_(3))underset(|)(CH)-overset(4)CH_(3))` |
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| 71. |
The IUPAC name of the following compound `CH_(3)-C(CH_(3))_(2)-CH=C(CH_(3))_(2)` isA. 1,1,3,3-Tetramethylbut-1-eneB. 1,3,3-Trimethylpent-2-eneC. 2,2,4-Trimethylbut-4-eneD. 2,4,4-Trimethylpent-2-ene |
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Answer» Correct Answer - D `underset("2, 4, 4-Trimethylpent-2-ene")underset()(overset(5)CH_(3)-overset(CH_(3))overset(|4)underset(CH_(3))underset(|)C-overset(3)CH=overset(CH_(3))overset(|2)C-overset(1)CH_(3))` |
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| 72. |
The IUPAC name of compound `CH_(3)-CH_(2)CH(CH_(3))CH_(2)COCl` isA. 3-Methylpentanoyl chlorideB. 3-Methylbutanoyl chlorideC. 1-Chloro-3-ethylbutanoneD. 1-Chloro-3-methylpentanone. |
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Answer» Correct Answer - A `underset("3-Methylpentanoyl chloride")underset()(overset(5)CH_(3)-overset(4)CH_(2)-overset(CH_(3))overset(3|)(CH)-overset(2)CH_(2)overset(1)COCl)` |
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| 73. |
The correct IUPAC name of `Br-CH_(2)-underset(CH)underset(|)CH_(2)Cl-[CH_(2)]_(5)-CHClBr` isA. 1-Bromo-1,8-dichloro-7-(bromomethyl) octaneB. 1,8-Dibromo-8-chloro-2-(c hloromethyIoctaneC. 1,8-Dibromo-1-chloro-7-( chloromethyIoctaneD. 1-Bromo-1,8-0 dichloro-2-(bromomethyl) octane. |
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Answer» Correct Answer - C Options Band D do not follow the lowest set of locant rule. Option C is correct because the substituent first cited in the alphabetic order is given preference. |
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| 74. |
The name of `Cl-CH_(2)-underset(Br)underset(|)(C)= underset(Br)underset(|)(C)-CH_(2)-Cl` according to the `IUPAC` nomenclature system isA. 2,3-Dibromo-1,4-dichlorobutene-2B. 1,4-Dichloro-2,3-dibromobutene-2C. DichlorodibromobuteneD. Dichlorodibromobutane |
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Answer» Correct Answer - A `underset("2, 3-Dibromo-1, 4-dichlorobut-2-ene")underset()(Cl-overset(4)CH_(2)-overset(3)underset(Br)underset(|)C=overset(2)underset(Br)underset(|)C-overset(1)CH_(2)-Cl)` |
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| 75. |
The IUPAC name of `C_(6)H_(5)COCl` isA. chlorobenzyl ketoneB. benzene chloroketoneC. benzenecarbonyl chlorideD. chlorophenyl ketone |
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Answer» Correct Answer - C Benzenecarbonyl chloride. |
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| 76. |
Give the IUPAC name for `{:(" "CH_(3)),(" |"),(CH_(3)CH_(2)OCHCH_(2)CH_(2)CH_(2)Cl):}`A. 2-ethyoxy-5-chloropentaneB. 1-chloro-4-ethyl-4-methylpentaneC. 1-chloro-4-ethoxypentaneD. ethyl-1-chloropentyl ether |
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Answer» Correct Answer - C `{:(" ".^(5)CH_(3)),(" |"),(CH_(3)CH_(2)O-overset(4)(C)H-overset(3)(C)H_(2)overset(2)(C)H_(2)overset(1)(C)H_(2)Cl):}` 1-Chloro-4-ehtoxypentane and not 2-ethoxy-5-chloropentane (lowest set of locants rule is followed) |
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| 77. |
Which is true regarding a plane polarized light?A. As it propagates, magnitude of electric vector varies periodically but direction of polarization remains unchanged.B. As it propagates,neither magnitudes nor direction of electric vector variesC. As it propagates, both magnitude of electric vector and direction of polarization variesD. Change in orientation of nicol prism has no effect on direction of polarization. |
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Answer» Correct Answer - A In plane polarised light, the magnitude of electric vector varies periodically but direction of polarisation remains fixed. |
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| 78. |
Which will show geometrical isomerism?A. B. C. D. |
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Answer» Correct Answer - D Follow conditions of geometrical isomerism. |
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| 79. |
Which of the following compound can show geometrical isomerism?A. B. C. D. |
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Answer» Correct Answer - c Follow conditions of geometrical isomerism. |
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| 80. |
A similarly between optical and geometrical isomerism is that?A. Each forms equal number of isomers for a given compoundB. If in a compound one is present, then so is the otherC. Both are included in stereoisomerismD. They have no similarity |
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Answer» Correct Answer - C Stereoisomerism includes geometrical and optical isomerism. |
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| 81. |
The correct statbility order of the following resonance structure is A. `IltIIIltIVltII`B. `IltIVltIIIltII`C. `IltIVltIIltIII`D. `IVltIltIIltIII` |
| Answer» Correct Answer - C | |
| 82. |
Resonance structure of a molecule cannot haveA. Identical arrangement of atomsB. Nearly the same energy contentC. The same number of paired electronsD. Identical bonding. |
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Answer» Correct Answer - D Resonance structures of a molecule does not have identical bonding. |
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| 83. |
Resonance in a molecule results inA. DestabilisationB. StabilisationC. Change in bond lengthD. Both 2 and 3 |
| Answer» Correct Answer - D | |
| 84. |
Pick up the error an write the correct IUPAC names for the following. (i) 3-Pentyne (ii) 1, 6-Hexadiene (iii) 2-Ethyl-2-pentene (iv) 1, 2-Dihydroxyethane (v) Pent-4-en-1-yne. |
| Answer» Correct Answer - (i) Pent-2-yne (ii) Hexa-1, 5-diene (iii) 3-Methylhex-3-ene (iv) Ethane-1, 2-diol (v) Pent-1-en-4-yne. | |
| 85. |
Write all possible chain isomers for pentene and hexyne . |
| Answer» structures of the compounds. | |
| 86. |
2.18g of an organic compound containing sulphur produces 1.02 g of `BaSO_(4)`. The percentage of sulphur in the compound isA. 0.0726B. 0.0898C. 0.1D. 0.0642 |
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Answer» Correct Answer - D % of `S=(32)/(233)xx(1.02)/(2.18)xx100=6.42%` |
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| 87. |
Which of the following represented the correct IUPAC names for the compounds concerned ? (a) 2, 2-Dichloropentane or 2-Dichloropentane (b) 2, 3-Dimethylpentane or 3, 4-Dimethylpentane (c) 2-Bromo-4-methylpentane or 4-Bromo-2-methylpentane (d) But-3-en-1-ol or But-4-ol-1-ene. |
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Answer» (a) 2, 2-Dichloropentane (b) 2, 3-Dimethylpentane (c) 2-Bromo-4-methylpentane (d) But-3-en-1-ol |
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| 88. |
Which of the following represents the correct IUPAC name of the compounds concerned ? (a) 2, 2-Dimethylpentane or 2-Dimethylpentane (b) 2, 3-Dimethylpentane or 3, 4-Dimethylpentane (c) 2, 4, 7-Trimethyloctane or 2, 5, 7-Trimethyloctane. (d) But-3-yn-1-ol ot But-4-ol-1-yne |
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Answer» (a) `{:(" "CH_(3)),(" |"),(overset(1)(C)H_(3)overset(2)(-C)-overset(3)(C)H_(2)-overset(4)(C)H_(2)-overset(5)(C)H_(3)),(" |"),(" "CH_(3)),(" 2, 2-Dimethylpentane"):}` (b) `{:(overset(1)(C)H_(3)-overset(2)(C)H-overset(3)(C)H-overset(4)(C)H_(2)-overset(5)(C)H_(3)),(" |"" |"),(" "CH_(3)" "CH_(3)),(" 2, 3-Dimethylpentane"):}` (c) `{:(overset(1)(C)H_(3)-overset(2)(C)H-overset(3)(C)H_(2)-overset(4)(C)H-overset(5)(C)H_(2)-overset(6)(C)H_(2)-overset(7)(C)H-overset(8)(C)H_(3)),(" |"" |"" |"),(" "CH_(3)" "CH_(3)" "CH_(3)),(" 2, 3-Dimethylpentane"):}` (b) `{:(overset(4)(C)H equiv overset(3)(C)-overset(2)(C)H_(2)-overset(1)(C)H_(2)-OH),(" But-3-yn-1-ol"):}` |
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| 89. |
In Carcuc method for the estimation of halogens. 250 mg of organic compound gave 141 mg of `AgBr`. The percentage of bromine in the compound is :A. 48B. 60C. 24D. 36 |
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Answer» Correct Answer - C `%` of `Br=80/188xx("Massof AgBr formed")/("Mass of substance taken")xx100` `=80/188xx((141 mg))/((250 mg))xx100=24` |
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| 90. |
Discuss the principle of estimation of halogens, sulphur and phosphorus present in an organic compound. |
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Answer» Estimation of halogens Halogens are estimated by the Carius method. In this method, a known quantity of organic compound is heated with fuming nitric acid in the presence of silver nitrate, contained in a hard glass tube called the Carius tube, taken in a furnace. Carbon and hydrogen that are present in the compound are oxidized to form `CO_(2)` and `H_(2)O` respectively and the halogen present in the compound is converted to the form of AgX. This AgX is then filtered, washed, dried, and weighed. Let the mass of organic compound be m g. Mass of AgX formed = `m_(1)` g 1 mol of Agx contains 1 mol of X. Therefore, Mass of halogen in m1 g of AgX =`("Atomic mass of X"xxm_(1)g)/("Molecular mass of AgX")` Thus % of halogen will be =`("Atomic mass of X"xxm_(1)xx100)/("Molecular mass of AgX"xxm)` Estimation of Sulphur In this method, a known quantity of organic compound is heated with either fuming nitric acid or sodium peroxide in a hard glass tube called the Carius tube. Sulphur, present in the compound, is oxidized to form sulphuric acid. On addition of excess of barium chloride to it, the precipitation of barium sulphate takes place. This precipitate is then filtered, washed, dried, and weighed. Let the mass of organic compound be m g. Mass of `BaSO_(4)` formed = `m_(1)` g 1 mol of `BaSO_(4)` = 233 g `BaSO_(4)` = 32 g of Sulphur Therefore, `m_(1)` g of `BaSO_(4)` contains `(32xxm_(1))/233` g of sulphur Thus percentage of sulphur =`(32xxm_(1)xx100)/(233xxm)` Estimation of phosphorus In this method, a known quantity of organic compound is heated with fuming nitric acid. Phosphorus, present in the compound, is oxidized to form phosphoric acid. By adding ammonia and ammonium molybdate to the solution, phosphorus can be precipitated as ammonium phosphomolybdate. Phosphorus can also be estimated by precipitating it as `MgNH_(4)PO_(4)` by adding magnesia mixture, which on ignition yields `Mg_(2)P_(2)O_(7)`. Let the mass of organic compound be m g. Mass of ammonium phosphomolybdate formed = `m_(1)` g Molar mass of ammonium phosphomolybdate = 1877 g Thus percentage of phosphorus=`(31xxm_(1)xx100)/(1877xxm)%` If P is estimated as `Mg_(2)P_(2)O_(7)`, Then, percentage of phosphorus=`(62xxm_(1)xx100)/(222xxm)%` |
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| 91. |
0.3160 g of an organic substance was heated with fuming nitric acid in a carius tube to convert phosphorus present into phosphoric acid. Addition of magnesia mixture formed `MgNH_(4)PO_(4)` which upon heating gave `0.1697 g Mg_(2)P_(2)O_(7)`. Calculate the percentage of phosphorus in the compound. |
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Answer» Correct Answer - `15` Percentage of phosphorus `=62/222xx("Mass of "Mg_(2)P_(2)O_(7))/("Mass of compound")xx100=62/222xx0.1697/0.3160xx100=15 %` |
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| 92. |
0.16g of an organic substance was heated in Carius tube and the sulphuric acid formed was precipitated as `BaSO_(4)` with `BaCl_(2)`. The weight of the dry `BaSO_(4)` was 0.35 g. Find the percentage of sulphur. |
| Answer» Correct Answer - `30.04%` | |
| 93. |
0.16 g of an organic substance was heated in carius tube and the sulphuric acid formed was precipitated as `BaSO_(4)` with `BaCl_(2)`. The weight of the dry `BaSO_(4)` was 0.35g Find the % of sulphur |
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Answer» % of `S=(32xx"wt. of" BaSO_(4))/(233xx"wt. of organic substance")xx100` % of `S=(32xx0.35)/(233xx0.16)xx100=30.04%` |
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| 94. |
0.2585g of an organic compound contaning iodine was heated with excess of strong nitric acid and silver nitrate in a carius tube. The precipitate of silver iodide was fiterred, washed and dried its weight was found to be 0.3894g . Calculate the % of iodine in the compound. |
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Answer» w=0.2585 wt. of Agl=0.3894 % of `i=(127xx0.3894)/(235xx0.2585)xx100=81.4%` |
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| 95. |
Will `C Cl_(4)` give white precipitate of AgCl on heating it with silver nitrate ? Give reason for your answer. |
| Answer» When `C Cl_(4)` is heated with `AgNO_(3)` solution, white ppt. of `AgCl` will not be formed. The reason being that `C Cl_(4)` is a covalent compound, therefore, it does not ionize to give `Cl^(-)` ions needed for the formation of ppt. of AgCl. | |
| 96. |
The Beilstein test is used in organic compounds for :A. CarbonB. SulphurC. NitrogenD. Halogens |
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Answer» Correct Answer - D Beilstein test is useful for halogens. |
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| 97. |
Statement-1. Beilstein test can be used to detect fluorine in the organic compound. Statement-2. CuF is not volatile and hence does not impart any colour to the flame.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is False |
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Answer» Correct Answer - D Correct statement-1. Beilstein test cannot be used to detect fluorine in the organic compound. |
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| 98. |
Will you get any precipitate if you add silver nitrate solution to chloromethane ? If not, why ? |
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Answer» No, because chloromethane is a colvalent compound and hence does not ionize to give `Cl^(-)` ions to react with `AgNO_(3)` `CH_(3)-Cl + AgNO_(3) rarr` No reaction. |
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| 99. |
Weak Acid does not dissociate completely into its ions. It is in equilibrium with its conugate base. Greater is the stability of conjugate base, greater is value of k for that equilibrium making the equilibrium move in `(Haoverset(K)hArrH+A^(-))` forward direction i.e. more is the degree of dissociation of that acid. Same is the case for weak bases. Factors affecting the stability of conjugate acid or base are electronic effect like resonance effect and inductive effect acting upon the species. Which of the following is having most acidic `alpha`-Hydrogen?A. `CH_(3)-NO_(2)`B. `underset(NO_(2))underset(|)(CH_(2))-NO_(2)`C. `NO_(2)-underset(NO_(2))underset(|)(CH)-NO_(2)`D. |
| Answer» Correct Answer - C | |
| 100. |
Among the molecules of ethane, ethylene, and acetylene, the `C-H` bond energy is theA. same in allB. lowest in ethaneC. greatest in ethyleneD. lowest in acetylene |
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Answer» Correct Answer - D C - H bond in ethane is longest and hence weakest. |
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