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Chemical Sciences

Description: GATE ENGINEERING AIEEE
Number of Questions: 15
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Tags: GATE Ionic and Covalent Bonding VSEPR Theory and Shape of Molecules Pollution and Global Warming Environmental Engineering Lipids and Carbohydrates Recycle of Solid Waste Aromatic Electrophilic Substitution Engineering Sciences - XE M.O. and V.B. Approaches for Diatomic Molecules
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Which of the following statements is/are true? A. Frankland reaction: The formation of alkenes by the action of zinc on alkyl halides. B. Reforming involves conversion of aliphatic into aromatic hydrocarbons. C. Corey-House reaction can be used to prepare only alkenes with odd number of carbon atoms.

  1. Only A

  2. Only B

  3. Only C

  4. Only A and C

  5. Only A and B

Show answer
Correct Option: E
Explanation:

This option is correct because the formation of alkenes by the action of zinc on alkyl halides is known as Frankland reaction and reforming involves conversion of aliphatic into aromatic hydrocarbons.

Which of the following represents the correct decreasing order of bond angles?

  1. NO2+ > NO2 > NO2-

  2. H2O > H2Se > H2S

  3. CH4 > H2O > NH3

  4. PI3 > PCl3 > PBr3

  5. SF4 > BrF3 > PCl5

Show answer
Correct Option: B
Explanation:

This option is correct as the correct decreasing order of bond angles  is H2O > H2S > H2Se, i.e., 104.5˚ > 92.5˚ > 91˚.

Which of the following statements is/are correct?

  1. Polypropylene, because of the presence of several chiral atoms is optically active.

  2. Gutta percha and natural rubber are stereoisomers.

  3. Intermolecular forces of attraction in nylons are dipole-dipole interactions.

  4. Vulcanization introduces hydrogen bondings between polymer chains.

  5. Dacron is a polyamide.

Show answer
Correct Option: B
Explanation:

This option is correct because gutta percha is all trans-polyisoprene while natural rubber is all cis-polyisoprene.

Match the list I with list II

 
List - I
List - II
i. Indigoid dyes a. Malachite green
ii. Azo dyes b. Congo red
iii. Anthraquinone dyes c. Indigo
iv. Triphenyl methane dyes d. Martius yellow
v. Nitro dyes e. Alizarin

  1. i - a, ii - c, iii - d, iv - e, v - b

  2. i - d, ii - c, iii - a, iv - b, v - e

  3. i - c, ii - b, ii i -e, iv - a, v - d

  4. i - b, ii - a, iii - c, iv - e, v - d

  5. i - d, ii - c, iii - b, iv - e, v - a

Show answer
Correct Option: C
Explanation:

This option is correct because all type of dyes are correctly matched with their examples.

Which of the following sets is of non -biodegradable insecticide?

  1. Dieldrin, Permethrin and Aldrin

  2. Aldrin, Dieldrin and BHC

  3. Parathion, Malathion and Methoxychlor

  4. Malathion, BHC and Methoxychlor

  5. DDT, BHC and Parathion

Show answer
Correct Option: B
Explanation:

This option is correct because aldrin, dieldrin and BHC are nonbiodegradable insecticides.

Which of the following statements is/are not false? A. In column chromatography, the more highly absorbed component is eluted with less polar solvents. B. Benzoic acid can be extracted from water using ethanol. C. Number of replaceable hydroxyl ions present in one molecule of a base is called its acidity.

  1. Only A

  2. Only A and B

  3. Only B

  4. Only C

  5. Only B and C

Show answer
Correct Option: D
Explanation:

This option is correct because number of replaceable hydroxyl ions present in one molecule of a base is called its acidity is true statement.

Assertion: Benzaldehyde forms two oximes on reacting with NH2OH. Reason: The two oximes arise due to geometrical isomerism around C = N bond.

  1. Both A and R are true and R is the correct explanation of A.

  2. Both A and R are true but R is NOT the correct explanation of A.

  3. A is false, but R is true.

  4. A is true, but R is false.

  5. Both A and R are false.

Show answer
Correct Option: A
Explanation:

This option is correct because benzaldehyde forms two oximes on reacting with NH2OH and the two oximes arise due to geometrical isomerism around C = N bond.

Which of the following sets is are artificial sweeteners?

  1. Aspartame, Alitame, Cane syrup

  2. Dulcin, Sucrose, Saccharin

  3. Sucrose, Lactose, Honey

  4. Sucrose, Sucralose, DHC

  5. Aspartame, Sucralose, Alitame

Show answer
Correct Option: E
Explanation:

This option is correct because Apartame, Sucralose and Alitame all are artificial sweetening agents.

Which of the following sets of molecules has all three types of bonds?

  1. S8, P4 and O3

  2. K3[Fe(CN)6], H3O+and [Cu(NH3)4]SO4

  3. CuSO4.5H2O, NH4Cl and K4[Fe(CN)6]

  4. NH3.BF3, KNH2 and AgNO3

  5. [Co(NH3)3Cl3], [Co(NH3)6]Cl3 and [Co(NH3)5Cl]Cl2

Show answer
Correct Option: C
Explanation:

This option is correct because all molecules have all three types of bonds, i.e., electrovalent, covalent and coordinate bonds.

Which of the following sets have only hypervalent molecules/ions?

  1. PCl5, SF6 and SF4+2

  2. I3-, XeO4 and SF4

  3. BF3, AlCl3 and ICl2-

  4. XeF2, KrF2 and AlCl3

  5. XeOF2, XeO3 and I3+

Show answer
Correct Option: B
Explanation:

This option is correct because all molecules exceed the octet rule, and hence all are hypervalent molecules.

Which of the reactions can not be used to distinguish allyl bromide from n-propyl bromide?

  1. Shaking with an aqueous solution of AgNO3.

  2. Boiling with aqueous KOH solution followed by acidification with dil. HNO3 and addition of AgNO3 solution.

  3. Fusion with sodium metal followed by acidification with dil. HNO3 and addition of AgNO3 solution.

  4. Both options 2 and 3

  5. All are correct

Show answer
Correct Option: D
Explanation:

On boiling with aqueous KOH solution, both allyl bromide and n-propyl bromide undergo hydrolysis, and hence give pale yellow precipitate of AgBr and fusion will convert both into NaBr and would subsequently give pale yellow precipitate of AgBr. Hence, option 2 and 3 both are correct.

Which of the following statements about control of particular pollution is/are not correct?

  1. Gravity settling chamber removes larger particles from the air.

  2. Cyclone collector removes fine particles in the diameter range 5-20 micron.

  3. Wet scrubbers are used to wash away all types of particulates.

  4. Both 2 and 3

  5. In electrostatic precipitator, the particulates are made acquire positive change, which are then attracted by the negative electrode and removed.

Show answer
Correct Option: E
Explanation:

This option is correct because particulates acquire negative charge and are attracted by the positive electrode.

Which of the following sets is of electron deficient molecules?

  1. IF7, F2-2 and XeF6

  2. XeOF4, XeO2F2 and ICl4-

  3. SF6, PCl5 and SnCl6

  4. BCl3, AlCl3 and PCl3

  5. B2H6, BeCl2 and BCl3

Show answer
Correct Option: E
Explanation:

This option is correct because boron and beryllium forms electron deficient compounds, so B2H6, BeCl2 and BCl3 all are electron deficient molecules.

Under the certain conditions an alkyl halide reacts with base to give an alkene and HCl (elimination reaction) for example: R-CH2-CH2-Cl → R-CH2=CH2 + HCl The extent of these reactions depends on the structure of alkyl halides (e.g. primary, secondary or tertiary). The relative extent to which such reactions take place is in the order (of haloalkanes) _______________.

  1. Primary > secondary > tertiary

  2. Primary > secondary > tertiary

  3. Primary > secondary < tertiary

  4. Primary < secondary > tertiary

  5. None of these

Show answer
Correct Option: B
Explanation:

This option is correct because on the basis of the stability of carbocation, which is formed during the reaction, i.e., 1˚ < 2˚ < 3˚ alkyl halide.

Which of the following statements is not true?

  1. The international standards of drinking water contain fluoride 1 ppm and Pb < 50 ppb.

  2. London smog is reducing in nature.

  3. To control CO emission by automobiles, catalytic convertors are fitted into the exhaust pipes.

  4. Oil slicks in sea water decreases D.O. values.

  5. Industrial flue gases are freed from NOx and SOx pollutants by scrubbing them with NaOH.

Show answer
Correct Option: E
Explanation:

This statement is false because industrial flue gases are freed from NOx and SOx pollutants by scrubbing them with H2SO4 or Ca(OH)2 or Mg(OH)2. Thus this option is correct.

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