Which of following statements is correct...

Which of following statements is correct in the zinc-blende-type structure of an ionic compound?

Coordination number of each cation and anion is `2`.

Coordination number of each cation and union is `4`.

Coordination number of each cation and union is `6`.

Coordination number of each cation and union is `8`.

Text Solution

Verified by Experts

The correct Answer is:

`ZnS` has diamond cubic structure in which `S^(2-)` ions from `bcc` lattice and `Zn^(2+)` ions are present in alternalte `TV_(s)`.
`Z_(eff)` of `S^(2-) = 4` (corner `+` face centre `= 3 + 4`).
`Z_(eff)` of `Zn^(2+) = 4`
(Total `TV_(s) = 8`, alternate `TV_(s) = 4`).
So `Z_(eff)` of `ZnS = 4`
Hence, the formula is `Zn_(4)S_(4)`.
So coordination number of `Zn^(2+)` and `S^(2-)` is `4` each.

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Which of the following statement is/are incorrect in the rock-salt structure if an ionic compounds ? (A) coordination number of cation is four where as that of anion is six.

coordination number of cation is four where as that of anion is six.

coordination number of cation is six where as that of anion is four.

coordination number of each cation and anion is four.

coordination number of each cation and anion is six.

Which one of the following statements is wrong about zinc blende type structure ?

Each `Zn^(2+)` ion is surrounded tetrahedrally by four `S^(2-)` ions and each `S^(2-)` ion by four `Zn^(2+)` ions

`S^(2-)` ions form fcc arrangement

AgBr has zinc blende type structure

Cuprous halides have zinc blende type structure

Which of the following statements is(are) correct for the diamond structure?

Each atom has `4` nearest neighbours and `12` next nearest neighbours.

It is relatively empty.

The maximum proportion of the available volume which may be filled by hard spheres is only `0.34`.

The maximum proportion of the available volume which may be filled by hard sphere is only `0.46`.