Answer:
When
\[CdC{{l}_{2}}\]is added to the crystals of \[AgCl,\] the replacement of one \[A{{g}^{+}}\]
ion with \[C{{d}^{2+}}\] ion necessitates the removal of second \[A{{g}^{+}}\]
ion from the lattice to maintain the electrical neutrality of the crystal.
However, the same does not take place in case of NaCI because both \[A{{g}^{+}}\]
and\[N{{a}^{+}}\] ions are monovalent. Thus, Schottky defects are caused by the
addition of \[CdC{{l}_{2}}\]and not by NaCI.
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