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Punjab (PTB) · Chapter test · Free

1st Year Chemistry Chapter 3 TestChemical Bonding

30 marks · 40 minutes · 21 questions. Covers: CHAP 3: Chemical Bonding.

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1st Year Chemistry Chapter 3 Test

1st Year · Chemistry · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 30Time: 40 minutes

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

  1. London dispersion forces increase with:

    1. Decreasing molar mass

    2. Increasing polarity

    3. Increasing molecular size

    4. Decreasing temperature

  2. In VSEPR, lone pair-lone pair repulsion is:

    1. Stronger than bond pair-bond pair

    2. Equal to bond pair-bond pair

    3. Weaker than bond pair-lone pair

    4. Absent

  3. Species has the highest bond order is:

    1. O2

    2. O2+

    3. O2

    4. O22-

  4. Molecular orbitals are formed by:

    1. Nucleus-nucleus interaction

    2. Electron-electron interaction

    3. Atomic orbital overlap

    4. Bond length contraction

  5. Species has a bent molecular shape is:

    1. CO2

    2. BeCl2

    3. NO2-

    4. BF3

  6. The shape of  according to the VSEPR model is:

    1. Tetrahedral

    2. Trigonal planar

    3. Trigonal bipyramidal

    4. T-shape

  7. Molecule requires the use of a double bond in its Lewis structure is:

    1. CO2

    2. CH4

    3. NH3

    4. HCl

  8. Molecules has nonpolar covalent bonds is:

    1. HF

    2. CO2

    3. O2

    4. NH3

  9. Which of the following species contains a dative bond?

    1. CH4

    2. NaCI

    3. NH4+

    4. O2

  10. In sp3 hybridization, the bond angle is:

    1. 180o

    2. 120o

    3. 109.5o

    4. 90o

Q2. Short questions (Attempt any 6 of 8 · 6 × 2 = 12)

  1. Sketch the hybrid orbital and bond formation in PCI3, SiCI4, and NH4+.

  2. Draw the Lewis (electron dot) structures for the following species: (i) HCN (ii) 3

  3. Write the molecular orbital configuration for C2.

  4. Draw the Lewis structures and tell whether the following ions involve expanded octets.

    (i) ii)

  5. Differentiate between dipole-dipole and hydrogen bonding.

  6. Compare melting points of ionic and metallic solids.

  7. Why is the bond angle in NH3 less than in CH4?

  8. The structure of propanone (acetone) is:(ii) Can propanone make a hydrogen bond with water when both are intermixed?

Q3. Long questions (Attempt any 2 of 3 · 2 × 4 = 8)

  1. Discuss the formation of F2 molecule in the light of Lewis concept, VBT, and MOT.

  2. Draw the molecular orbital diagrams of the following molecules. Calculate their bond orders. (i) H2 (ii) He2  (iii) N2 (iv) O2

  3. What are the postulates of VSEPR model? Discuss the structures of the following species with reference to this theory. (i) CH4 (ii) NH3 (iii) H3O+ (iv) PCl5 (v) SO2 (vi) SF6