Which of the following statment(s) is (are) correct?  

Options

A. When the radius ratio is in the range `0.414 - 0.732`, a B.C.C arrangement with co-ordination no.8
B. When the radius ratio is in the range `0.225 -0.414,` a tetrahedral arrangement with co-ordination no. 4.
C. When the radius ratio is in the range 0.155 - 0.225, an octahedral arrangement with co-ordination no. 6.
D. In `B_(2)O_(3)`, smaller cations occupy triangular voids and a planar trigonal arrangement with co-ordination no.3

Answer

B, D

Explanation

Radius ratio = 0.414-0.732 C.N = 6 octahedral
0.225-0.414 Tetrahedral C.N = 4
In `B_(2)O_(3)` smaller cations occupy triangular voids and a planar trigonal arrangement with C.N = 3