(D) When $CdCl_2$ is added to $AgCl$,$Cd^{2+}$ ions replace some of the $Ag^+$ ions. To maintain electrical neutrality,for every $Cd^{2+}$ ion introdu

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(D) When $CdCl_2$ is added to $AgCl$,$Cd^{2+}$ ions replace some of the $Ag^+$ ions. To maintain electrical neutrality,for every $Cd^{2+}$ ion introduced,two $Ag^+$ ions are removed,creating one cation vacancy. This type of defect is known as an impurity defect.