Order Chemical Bonding Assignment
1. PCl5
has trigonal bipyramidal shape, but ,F5
has square pyramidal shape. Explain.
2. A compound AB3
is triangular planar. When B
is added it becomes AB4
. When B
is removed from AB3
, it becomes
AB2
. What are the geometries of AB4
and AB2
?
3. Hydrogen is diatomic but He is monatomic. Explain using M.O. theory.
4. Explain the following.
(i) SnCl2
is ionic where as SnCl4
is covalent.
5. Explain, why the experimentally determined P – O bond length in POCl3
is greater than the sum of double bond
covalent radii of P and O?
6. Using the physical properties, how will you distinguish the following?
(i) BaO and MgO
(ii) Br2
and ,Cl
Order Chemical Bonding Assignment
7. How will you distinguish between the following molecules in terms of dipole moment?
(i) PCl3
(ii) NH3
(iii) BrF5
(iv) BF3
8. Na2
SO4
is readily soluble in water whereas BaSO4
is only sparingly soluble, why?
9. NH4
Cl is highly soluble in water than NaCl. Explain.
10. Even though BaSO4
is an electrovalent compound, it is insoluble in water. Explain.
Straight Objective Type Questions
Directions: This section contains multiple choice questions. Each question has 4 choices (a), (b), (c) and (d), out of
which ONLY ONE is correct.
11. Calcium forms CaCl2
rather than CaCl because
(a) the removal of second electron from calcium requires only less energy.
(b) the electron gain enthalpy value is greater than the ionization energy of calcium to Ca2 .
(c) more energy is released during the formation of CaCl2(s) than formation of CaCl.
(d) CaCl is a covalent molecule while CaCl2
is ionic.
12. Identify the correct statement regarding the trio.
(a) Bond length decreases with increase in s character of hybridized orbitals.
(b) Increase in repulsion between hydrogen atoms decreases the bond length.
4.48 Chemical Bonding
(c) Decreasing b.p b.p repulsion decreases the bond angle.
(d) Increase in non bonding electron pair increases the bond angle.
13. Considering the molecular orbitals represented below, the bonding combination is
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