7 ques. Pls n the HCI
e atoms in
as actual
and elec-
Additional Objective Questions
325
diagram and use it to calculate the lattice energy of
magnesium oxide. How does the lattice energy of MgO
compare with that of NaCl? What might account for the
difference?
7. A molecule HX has 871% covalent character. Identify X if
the electronegativities of halogens are as follows: F z 4.0,
= 28.
The value of electronegativity of atoms A and B are 1.20
8.
and 4.0. respectively. What is the percentage Of ionic char-
Of A—B tkM1d?
9. Write formal charge of the atoms in the nitrite ion.
the lattice enthalpy of CaC12, given that the
of
of Ca is 121 kJ mort ,
(b/ of Cl: to CI is 242.8 kJ mori.
of Ca to Ca2• is 2422 kJ mol-l ,
_ is kJrnori and
