What type of the following defect is produced when NaCl crystal is doped with MgCl ₂ ?

Step-by-step solution

When NaCl crystal is doped with MgCl ₂ , Mg ²⁺ ions replace Na ^+ ions in the crystal lattice. To maintain electrical neutrality, one Mg ²⁺ ion replaces two Na ^+ ions. One Mg ²⁺ ion occupies the site of one Na ^+ ion, leaving the other site vacant, which creates a cation vacancy. Since a foreign ion is introduced into the host crystal, this type of defect is known as an impurity defect. Answer: Impurity defect