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# In which of the following crystals alternate tetrahedral voids are occupied

$(a)\;NaCl\qquad(b)\;ZnS\qquad(c)\;CaF_2\qquad(d)\;Na_2O$

In ZnS structure , Sulphate ions occupy all the lattice points while $Zn^{2+}$ ions are present in alternate tetrahedral voids.