Question

The $r_+ / r_-$ ratio of ZnS is 0.402. Pick out the false statements of the following

• A. ZnS is 4 : 4 coordination compound.
• B. ZnS does not crystallize in rock salt type lattice because $r_+ / r_-$ is too small to avoid overlapping of $S^{2-}$ ions.
• C. $\ce{Zn^{2+}}$ ion is too small to fit precisely into the octahedral voids of $\ce{S^{2-}}$ ions.
• D. $\ce{Zn^{2+}}$ ion is too large to fit into the octahedral voids of $\ce{S^{2-}}$ ions.

Answer 1

Answer: (D)

$\ce{Zn^{2+}}$ ion is too large to fit into the octahedral voids of $\ce{S^{2-}}$ ions.

Answer 2

${Zn^{2+}}$ ion is too small to fit into the octahedral voids of ${S^{2-}}$ ions.