Physical Chemistry Answers

On the basis of dipole study, predict whether HF compound is purely ionic
or polar covalent. The bond length of HF is 92 pm and dipole moment is
1.92 D.

Predict the coordination number of Ca2+ in CaO crystal and also its crystal
structure. [Hint: use data for ionic radii values given in your Unit]

Taking suitable examples, describe briefly resonance and hybridization.
Predict the hybridization of each carbon in the acetate ion

By constructing a molecular orbital picture for each of the following
molecules, determine whether it is paramagnetic or diamagnetic.

 B2
;
 O2
;
2 N2
;
CO;
2 C2
(5)

Define gerade and ungerade orbits. Classify the following orbitals as gerade
or ungerade:
(i) 1s (ii) 2px (iii) 3dxy

Arrive at the Lewis structure of PCl5 and XeF4 using the steps indicated in
your Unit

Write down Born-Haber cycle for CaCl2 formation

Explain the reason for the variation of the first ionization energies of
the third period elements.

Write the values of all four quantum numbers for 2p electrons. Discuss their
significance in brief.

What is a well-behaved wave function? Illustrate with diagrams.