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Chemical Science Test - 4

GATE

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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following sets is/are used as artificial sweetening agent?

  1. Aspartame, Alitame and Cane syrup
  2. Dulcin, Sucrose and Saccharin
  3. Sucrose, Sucralose and DHC
  4. Sucrose, Lactose and Honey
  5. Aspartame, Sucralose and Alitame
Question 2 Multiple Choice (Single Answer)

Which of the following statements are true?
A. Number of replaceable hydroxyl ions present in one molecule of a base is called its acidity.
B. Benzoic acid can be extracted from water using ethyl alcohol.
C. In column chromatography more highly absorbed component is eluted with less polar solvents.

  1. Only A
  2. Only B
  3. Only C
  4. Only A and B
  5. Only B and C
Question 3 Multiple Choice (Single Answer)

Which of the following sets of molecular ions, have T-shaped geometry?

  1. H3O+, AlCl3 and NO2-
  2. ICl2-, I3- and ClF2-
  3. NF3, PCl3 and SO3
  4. NH2-, BCl3 and ICl2+
  5. BrF3, IF3 and XeOF2
Question 4 Multiple Choice (Single Answer)

Which of the following statements is/are correct about polar stratospheric clouds (PSCs)?

  1. PSCs do not react with chlorine nitrate and HCl.
  2. A tight whirlpool of wind called polar vortex is formed which surrounds Antarctica.
  3. Type II clouds are formed at about - 85˚C and contain some ice.
  4. Type I clouds are formed at about - 77˚C and contain solid HNO3.3H2O.
  5. Statements 2 and 4 are correct.
Question 5 Multiple Choice (Single Answer)

Which of the following sets of ions does not give coloured solution?

  1. Cu+, Nb+5 and Cu+2
  2. Ir+4, Mo+4 and Y+3
  3. Ta+5, W+2 and Zn+2
  4. Cr+6, Pt+4 and Re+7
  5. Zr+4, Hf+4 and Os+8
Question 6 Multiple Choice (Single Answer)

Which of the following statements is not false?
A. The dihedral angle between the H-atom is staggered conformation of ethane is 60˚.
B. C2H5O2N shows functional isomerism as well as tautomerism.
C. Cyclopropane is better fuel than propane.

  1. Only A
  2. Only B
  3. Only A and C
  4. Only B and C
  5. All of these
Question 7 Multiple Choice (Single Answer)

Which of the following statements is/are correct?

  1. Caprolactam is obtained by Beckmann rearrangement of acetophenone oxime.
  2. Gutta percha and natural rubber are stereoisomers.
  3. Denatururation involves changes in the primary structure of proteins.
  4. Intermolecular forces of attraction in nylons are dipole-dipole interactions.
  5. At isoelectric point, an α-amino acid has the minimum solubility.
Question 8 Multiple Choice (Single Answer)

Match the column I with column II:

 
Column I 
        </strong>|<strong>Column II</strong>|

|i. Mineral Acids|a. Chemical fertiliser|
|ii. Polyphosphate|b. Domestic sewage|
|iii. Sediments|c. Abandoned coal mines|
|iv. Microorganism|d. Erosion of soil by strip mining|
|v. Plant nutrients|e. Detergents|

  1. i - d, ii - e, iii - c, iv - b, v - a
  2. i - a, ii - c, iii - d, iv - b, v - e
  3. i - c, ii - e, iii - d, iv - b, v - a
  4. i - c, ii - e, iii - d, iv - a, v - b
  5. i - e, ii - b, iii - c, iv - d, v - a
Question 9 Multiple Choice (Single Answer)

The mixture of 1-chlorobutane and 2-chlorobutane when treated with alcoholic KOH gives ___________.

  1. isobutylene
  2. 1-Butene
  3. 2-Butene
  1. Only 1
  2. Only 2
  3. Only 3
  4. Only 1 and 2
  5. Only 2 and 3
Question 10 Multiple Choice (Single Answer)

Which of the following statements is/are false?

  1. FeSO4 gives sulphur dioxide on heating.
  2. Transition metals show catalytic properties and form interstitial compounds with noble gases.
  3. Silver is a better conductor of electricity than copper.
  4. CrO4-2 and MnO4-2 have tetrahedral structure.
  5. Ni+2 compounds are thermodynamically more stable than Pt+2.
Question 11 Multiple Choice (Single Answer)

Which of the following statements is/are correct?
A. Allene is a planar molecule.
B. [14]-Annulene is aromatic while [10]-annulene is not aromatic.
C. The carbocation F3C-C+ is less stable than the carbocation F3C+.

  1. Only A
  2. Only A and B
  3. Only A and C
  4. Only B and C
  5. All of these
Question 12 Multiple Choice (Single Answer)

Match the entries in column A with those in column B:

 
Column A 
        </strong>|<strong>Column B</strong>|

|a. Lysergic acid diethylamide|i. A sweet protein|
|b. Sodium lauryl sulphate|ii. Hallucinogen|
|c. Urethane|iii. Poly trans-isoprene|
|d. Monallelin|iv. Detergent|
|e. Gutta percha|v. Esters of H2NCOOH|
| |vi. Artificial sweetner|

  1. a - iv, b - v, c - iii, d - i, e - ii
  2. a - vi, b - iv, c - ii, d - v, e - iii
  3. a - iv, b - v, c - iii, d - ii, e - i
  4. a - ii, b - vi, c - v, d - i, e - iv
  5. a - ii, b - iv, c - v, d - i, e - iii
Question 13 Multiple Choice (Single Answer)

Match the Column I molecules/molecular ions with Column II bond orders and Column III magnetic properties:

   
Molecular ion 
        </strong>|<strong>Bond order
        </strong>|<strong>Magnetic character</strong>|

|(i) H2+|a. 2.5|x. Paramagnetic|
|(ii) C2|b. 3.0|y. Diamagnetic|
|(iii) CN-|c. 0.5| |
|(iv) O2-|d. 1.0| |
|(v) NO|e. 2.0| |
|(vi) F2|f. 1.5| |

  1. i - a - y, ii - d - x, iii - b - x, iv - c - y, v - f - x, vi - e - y
  2. i - e - y, ii - c - x, iii - f - x, iv - b - y, v - a - x, vi - d - y
  3. i - c - y, ii - e - x, iii - b - x, iv - f - y, v - a - y, vi - d - x
  4. i - a - x, ii - d - y, iii - b - y, iv - c - x, v - f - y, vi - e - x
  5. i - c - x, ii - e - y, iii - b - y, iv - f - x, v - a - x, vi - d - y
Question 14 Multiple Choice (Single Answer)

In aniline, the –NH2 group:
A. activates the benzene ring via both inductive and resonance effect.
B. activates the benzene ring via resonance effect and deactivates it via inductive effect.
C. activates benzene ring via inductive effect and deactivates it via resonance effect.

  1. Only A
  2. Only B
  3. Only C
  4. Only A and B
  5. Only A and C
Question 15 Multiple Choice (Single Answer)

Which of the following set is hypervalent molecule?

  1. I3-, XeO4 and SF4
  2. BF3, AlCl3 and ICl2-
  3. XeF2, KrF2 and AlCl3
  4. PCl5, SF6 and SF4+2
  5. XeOF2, XeO3 and I3+
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