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Q. A mineral having the formula AB(2) cr...

Q. A mineral having the formula `AB_(2)` crystallises in the cubic closed packed lattice, with `A^(2+)` atoms occupying the lattice points and `B^(-)` tetrahedral voids. the coordination number of A, B and fraction of the tetrahedral sites occupied by B atom respectively are:

A

8,4,100%

B

4,8,100%

C

8,6,57%

D

6,8,57%

Text Solution

Verified by Experts

The correct Answer is:
A
`AB_(2)` has bcc structure, `A^(2+)` posses face centred cubic lattice `B^(-)` ions occupy all the (100%) tetrahedral voids. Thus each `A^(2+)` is in contact with `8B^(-)` and each `B^(-)` with `4A^(2+)` ions.
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