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Theories of Covalent Bonding and Shapes of Molecules: MCQs

 

chemicalAlgebra

1. The bond energies of F2,

Cl2, Br2 and I2 are 37, 58, 46 and 36 Kcal, respectively. The strongest bond is formed in




... Answer is B)
Description: The bond energy is proportional to bond length. So, the bond strength of Cl2 is higher.

2. The percentage of ionic character of bond between two atoms is calculated from the difference between their





... Answer is B)
Description: The percentage of ionic character depends upon the difference of E.N. difference between the bonded atom. Greater the E. N. difference, greater the ionic character and hence greater the bond energy

3. The geometry of PF5 molecule is





... Answer is C)
Description: As it has five bond pairs of electron, so its geometry is trigonal pyramidal

4. sp3 hybridization is important in describing the bonding in except





... Answer is D)
Description: In NH4+ nitrogen is sp3 hybridized, in CCl4 C is sp3 hybridized and in H2O, O is sp3 is hybridized.

5. Greater the dipole moment





... Answer is A)
Description: Both dipole moment and ionic character depend upon the polarity of the bond. If molecule has greater polarity, greater the dipole moment and ionic character.

6. A diatomic molecule has a dipole moment of 1.2 D. If the bond distance is 1.0 AO. What fraction of charge 'e' exists on each atom?





... Answer is C)
Description: µ = 1.2 D = 4 × 10-30 C.m. r = 1.0AO = 10-10. We know, µ = q × r, q = µ/r = 4 × 10-30 /10-10 = 4 × 10-20 So, fraction of negative charge = 4 × 10-20 ×100/ 1.6022 × 10-19 = 25%.

7. H-O-H bond angle in H2O is 104.5O and not 109.28O because of





... Answer is D)
Description: Bond angle in H-O-H bond angle is furthr reduced due to repulsion between lone pair and bond pair of electron.

8. Which is not the characteristics of π bond?





... Answer is B)
Description: Hybrid orbitals can only make sigma bonds. π bond is formed by parallel overlapping of P orbitals of already sigma bonded atoms.

9. In the formation of N2+ from N2, the electron is removed from





... Answer is A)
Description: In case of nitrogen due to hybridization of 2s and 2p atomic orbitals, energy of σ2px orbital is higher than π2py = π2pz orbital orbital. Valence electrons are present in σ2px orbital.

10. According to VSEPR theory, the most probable shape of the molecule having 4 electron pairs around the central atom is





... Answer is B)
Description: AB2 type, AB3 type, AB4 type, AB5 type and AB6 type system have Linear, trigonal, tetrahedral, pentagonal and hexagonal geometry, respectively.

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Comments

  1. UnknownJuly 2, 2021 at 9:06 AM

    Nice work...this is the best u can provide

    ReplyDelete
  2. UnknownJuly 3, 2021 at 8:59 PM

    Sir i like this type MCQs. Plz upload MCQs of remaining excercise. Thanks

    ReplyDelete
  3. UnknownMarch 10, 2022 at 11:05 AM

    Good sir g

    ReplyDelete

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