1.

A solide `A^(+)B^(-)` has the `B^(-)` ions arranged as below. If the `A^(+)` ions occupy half of the tetrahedral sites in the structure. The formula of solid is `:` A. `AB`B. `AB_(2)`C. `A_(2)B`D. `A_(3)B_(4)`

Answer» Correct Answer - a
In a closed packed structure, the number of tetrahedral voids per atom of the crystal is two. Since half of the tetrahedral voids are occupied by `A^(+)` , the number of `A^(+)` is same as that of `B^(-)` in the crystal . Thus formula is `AB`.


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