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Chemical Science Test - 4

Description: GATE
Number of Questions: 15
Created by:
Tags: GATE M.O. and V.B. Approaches for Diatomic Molecules Lipids and Carbohydrates Recycle of Solid Waste Causes of Air Pollution General Characteristics of 3d Elements Aromatic Electrophilic Substitution Tautomerism Engineering Sciences - XE Coordination Complexes Concept of Aromaticity
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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

Show answer
Correct Option: E
Explanation:

This option is correct because aspartame, sucralose and alitame all are artificial sweetening agents.

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

Show answer
Correct Option: A
Explanation:

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

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

Show answer
Correct Option: E
Explanation:

This option is correct because for minimum repulsion between the electron pairs two lone pairs occupy the basal positions and out of three bond pairs, one occupies basal position and two along axial positions. Thus according to VSEPR theory all molecules, IF3, XeOF2 and BrF3 possess T-shaped geometry.

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.

Show answer
Correct Option: C
Explanation:

This statement is correct because Type II clouds are those which are formed at about - 85˚C and contain some ice. So this option is wrong.

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

Show answer
Correct Option: E
Explanation:

This option is correct because the compounds which do not have d-electrons or have filled (n-1)d orbitals (d10) are colourless. Zr+4, Os+8 and Hf+4 have vacant d-orbital (d0), so all are colourless.

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

Show answer
Correct Option: E
Explanation:

This option is correct because dihedral angle between the H-atom is staggered conformation of ethane is 60˚, nitroethane shows tautomerism due to presence of α-hydrogens and functional isomerism with ethylnitrite and because of angle stain, the heat of combustion of cyclopropane is higher than that of propane.

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.

Show answer
Correct Option: B
Explanation:

This option is correct because gutta percha is trans-polyisoprene while natural rubber is cis-polyisoprene. This statement is true because at isoelectric point, an α-amino acid has the minimum solubility. Thus this option is correct.

Match the column I with column II:

 
Column I
Column II
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

Show answer
Correct Option: C
Explanation:

This option is correct because abandoned coal mines produce mineral acid, detergents are the source of polyphosphate, erosion of soil by strip mining give sediments, domestic sewage is the source of microorganisms and chemical fertilizers are the source of plant nutrients.

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

Show answer
Correct Option: E
Explanation:

This option is correct because on treating with alcoholic KOH, 1-chlorobutane gives 1-butene while 2-chlorobutane gives 2-butene (major) + 1-butene (minor). Therefore a mixture of 1-butene and 2-butene is formed.

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.

Show answer
Correct Option: B
Explanation:

This option is correct because transition metals show catalytic properties and form interstitial compounds with p-block elements like boron, carbon, nitrogen, etc.

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

Show answer
Correct Option: D
Explanation:

This option is correct because [14]-annulene is aromatic while [10]-annulene is not aromatic.  

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

 
Column A
Column B
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

Show answer
Correct Option: E
Explanation:

Lysergic acid diethylamide - Hallucinogen, Sodium lauryl sulphate - Detergent, Urethane - Esters of H2NCOOH, Monallelin - A sweet protein and Gutta percha - Poly trans-isoprene. Thus, this option is correct.

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

   
Molecular ion
Bond order
Magnetic character
(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

Show answer
Correct Option: E
Explanation:

This option is correct because all the molecular ions are correctly matched with their bond order and magnetic properties. According to molecular orbital energy level diagram: for example of energy levels of molecular orbitals of O2- : σ1s2, σ*1s2, σ2s2, σ*2s2, σ2pz2, π2p x 2=π2py2, π*2px2=π*2py1 Bond order = 1/2 (number of bonding electrons-number of antibonding electrons) = 1/2 (10-7) = 1.5 And due to the presence unpaired electron in π*2py1 molecular orbital, this molecule is paramagnetic.

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

Show answer
Correct Option: B
Explanation:

This option is correct because in aniline, –NH2 group activates the benzene ring via resonance effect and deactivates it via inductive effect.

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+

Show answer
Correct Option: A
Explanation:

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

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