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Chemical Structure and Bonding

Description: GATE VSEPR Theory and Shape of MoleculesCoordination ComplexesB, Al, Si, N, P, and SPVC and Polyester Synthetic FibersProteinsGeneral Characteristics of 3d ElementsIonic and Covalent Bondings.p. and d Block ElementsGeometry and Magnetic Properties
Number of Questions: 15
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Tags: GATE VSEPR Theory and Shape of Molecules Coordination Complexes B, Al, Si, N, P, and S PVC and Polyester Synthetic Fibers Proteins General Characteristics of 3d Elements Ionic and Covalent Bonding s.p. and d Block Elements Geometry and Magnetic Properties
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Which of the following is a pair of polyesters?

  1. Styron and Teflon

  2. Styron and Dacron

  3. Dacron and Glyptal

  4. Glyptal and Perlon

  5. Teflon and Perlon

Show answer
Correct Option: C
Explanation:

Dacron and glyptal are polyesters. Dacron is a copolymer of ethylene glycol and terephthalic acid. Glyptal is copolymer of ethylene glycol and phthalic acid.

Which of the following enzymes contain(s) cobalt?

  1. Methionyl aminopeptidase
  2. Cytochrome oxidase
  3. Laccase
  4. Isobutyryl-CoA mutase

  1. Only 1

  2. 1 and 2

  3. 2 and 3

  4. Only 4

  5. 1 and 4

Show answer
Correct Option: E
Explanation:

This option is correct because Methionyl aminopeptidase and Isobutyryl-CoA mutase are cobalt containing enzymes.

Which of the following are globular proteins?

  1. Insulin
  2. Visual purple
  3. Myosin
  4. Collagen
  5. Keratin
  6. Thrombin

  1. 1, 2 and 3

  2. 1, 2 and 6

  3. 2, 3 and 5

  4. 2, 4 and 6

  5. 4, 5 and 6

Show answer
Correct Option: B
Explanation:

This option is correct because insulin, visual purple and thrombin are all globular proteins.

Which of the following sets represents only diamagnetic ions?

  1. Cu2+, Zn2+, Sc3+

  2. Zn2+, Sc3+, Ti4+

  3. Cu+, Mn2+, Cr3+

  4. Ni2+, Cu2+, Zn2+

  5. Cu+, Mn2+, Sc3+

Show answer
Correct Option: B
Explanation:

Zn2+: [Ar] 3d10 4s0; no unpaired electron; diamagnetic Sc3+: [Ar] 3d0 4s0; ; no unpaired electron; diamagnetic Ti4+: [Ar] 3d0 4s0; no unpaired electron; diamagnetic

Which of the following statements are false regarding ammonia?

  1. Liquid ammonia is concentrated solution of NH3 in water.
  2. Ammonia is a non-combustible hydride.
  3. Ammonia has a higher dielectric constant than water.
  4. Liquid ammonia is used in refrigeration.

  1. 1 and 2

  2. 1 and 3

  3. 2 and 3

  4. 2 and 4

  5. 3 and 4

Show answer
Correct Option: B
Explanation:

This is correct because liquor ammonia is a concentrated solution of NH3 in water while liquid ammonia is liquefied ammonia gas. Ammonia has a dielectric constant value of 22 which is lower than water (82).

Which of the following statements are incorrect? P. Basicity of phosphorous acid is three. Q. The bleaching action of SO2 is due to its reducing action. R. Sulphur acts as an oxidising agent in the vulcanisation of rubber. S. The C-C bond length in graphite is shorter than that in diamond.

  1. P and Q

  2. P and R

  3. Q and R

  4. Q and S

  5. R and S

Show answer
Correct Option: B
Explanation:

This option is correct because the basicity of phosphorous acid (H3PO3) is two and sulphur acts as cross linking agent in the vulcanisation of rubber.

Match the column I with column II:Column I |Column II| |A. Philosopher’s wool|1. Sodium chloride| |B. Nitre|2. Potassium nitrate| |C. Tablet salt |3. Potassium carbonate| |D. Pearl ash |4. Zinc oxide|

  1. A-4, B-2, C-1, D-3

  2. A-2, B-4, C-1, D-3

  3. A-3, B-1, C-2, D-4

  4. A-1, B-3, C-4, D-2

  5. A-3, B-4, C-1, D-2

Show answer
Correct Option: A
Explanation:

Philosopher’s wool-Zinc oxide, Nitre-Potassium nitrate, Tablet salt-Sodium chloride and Pearl ash-Potassium carbonate. Thus, this option is correct.

Which of the following statements is/are false? P. Sulphide ores are concentrated by froth floatation process. Q. Calcination is the process of heating the ores strongly in the presence of excess air. R. Roasting is the process of heating the ores strongly in the absence of air. S. The impurities present in the ores are called gangue.

  1. Only P

  2. P and Q

  3. Only R

  4. Q and R

  5. R and S

Show answer
Correct Option: D
Explanation:

This option is correct because calcination is the process of heating the ores strongly in the absence of air and roasting is the process of heating the ores strongly in the presence of excess air.

Which of the following are the ores of plumbum?

  1. Anglesite
  2. Argentite
  3. Calaverite
  4. Cassiterite
  5. Cerussite
  6. Galena

  1. 1, 3 and 5

  2. 1, 5 and 6

  3. 2, 3 and 5

  4. 2, 4 and 6

  5. 3, 4 and 6

Show answer
Correct Option: B
Explanation:

Anglesite (PbSO4) is an ore of plumbum. Cerussite is a mineral consisting of lead carbonate (PbCO3), and an important ore of plumbum. Galena (PbS) is the primary ore mineral of plumbum.  

Which solid will have weakest intermolecular forces?

  1. Ice

  2. Phosphorus

  3. Naphthalene

  4. Sodium fluoride

  5. Anthracene

Show answer
Correct Option: A
Explanation:

This option is correct because ice has the lowest melting point out of the given solids. Hence, it has the weakest intermolecular forces.

Which of the following statements are false regarding transition elements?

  1. Osmium is the densest transition metal.
  2. All the elements of 3d series are good reducing agents.
  3. Highest oxidation state shown by any transition element is +7.
  4. The reactivity of transition elements decreases with the increase in their atomic number.

  1. 1 and 2

  2. 1 and 3

  3. 2 and 3

  4. 2 and 4

  5. 3 and 4

Show answer
Correct Option: C
Explanation:

This option is correct because all the elements of 3d series are good reducing agents except copper and the highest oxidation state shown by any transition element is +8 (Ru in 4d series and Os in 5d series).

Match the column – I (molecules) with column – II (bond angles) and select the correct answer ||| |---|---| |Molecules |Bond angles| |A. XeOF5−|1. 90°, 72° and 180°| |B. BrF5|2. 90° and 180°| |C. SF4|3. 72°, 90° and 144° | |D. IF7|4. 173.1° and 101.6°|

  1. A - 4, B - 3, C - 2, D - 1

  2. A - 2, B - 1, C - 4, D - 3

  3. A - 2, B - 1, C - 3, D - 4

  4. A - 3, B - 2, C - 4, D - 1

  5. A - 1, B - 2, C - 3, D - 4

Show answer
Correct Option: D
Explanation:

This option is correct because all the angles are correctly matched with their molecules. XeOF5− - 72°, 90° and 144° BrF5 - 90° and 180° SF4 - 173.1° and 101.6° IF7 - 90°, 72° and 180°

Which of the following is a pair of covalent network solids?

  1. Sugar and quartz

  2. Buckminsterfullerene and dry ice

  3. Buckminsterfullerene and quartz

  4. Dry ice and sugar

  5. Barium oxide and quartz

Show answer
Correct Option: C
Explanation:

Buckminsterfullerene and quartz are both covalent network solids.

In which of the following types of crystal systems, all unit cell vector angles are equal?

  1. Hexagonal
  2. Monoclinic
  3. Orthorhombic
  4. Tetragonal

  1. 1 and 2

  2. 1 and 3

  3. 2 and 3

  4. 2 and 4

  5. 3 and 4

Show answer
Correct Option: E
Explanation:

Orthorhombic crystal system: Unit cell vector lengths a≠ b ≠ c and unit cell vector angles α = β = γ = 90° Tetragonal crystal system: Unit cell vector lengths a = b ≠ c and unit cell vector angles α = β = γ = 90°

Match the column A (molecular ions) with column B (shapes) ||| |---|---| |Molecular ions |Shapes| |A. XeF82−|1. Planar pentagonal| |B. XeF5−|2. Tricapped trigonal prismatic| |C. ReH92−|3. Pentagonal pyramidal| |D. XeOF5−|4. Square antiprismatic|

  1. A - 4, B - 1, C - 2, D - 3

  2. A - 4, B - 2, C - 1, D - 3

  3. A - 1, B - 2, C - 3, D - 4

  4. A - 2, B - 3, C - 4, D - 1

  5. A - 3, B - 4, C - 1, D - 2

Show answer
Correct Option: A
Explanation:

This option is correct because all the molecular ions are correctly matched with their shapes. XeF82− - Square antiprismatic XeF5− - Planar pentagonal ReH92− - Tricapped trigonal prismatic XeOF5− - Pentagonal pyramidal

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