# The ${\mathrm{r}}_{+}/{\mathrm{r}}_{-}$ ratio of ZnS is 0.402. Pick out the false statements of the following

1. A

ZnS is 4: 4 coordination compound.

2. B

ZnS does not crystallize in rock salt type lattice because ${\mathbf{r}}_{+}/{\mathrm{r}}_{-}$s too small to avoid overlapping of ${\mathrm{S}}^{2-}$ ions

3. C

${\mathrm{Zn}}^{2+}$ ion is too small to fit precisely into the octahedral voids of S2- ions

4. D

${\mathrm{Zn}}^{2+}$ion is too large to fit into the octahedral voids of S2- ions.

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### Solution:

Zn2+ ion is too small to fit into the octahedral voids of S2− ions.

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