Match List I with List II. List I Type of Void List II Coordination n…

The correct answer is option 4. (A)-(IV), (B)-(III), (C)-(II), (D)-(I).

List I Type of Void	List II Coordination number
(A) Trigonal void	(IV) 3
(B) Tetrahedral void	(III) 4
(C) Octahedral void	(II) 6
(D) Cubical void	(I) 8

Trigonal void (2-D void): These voids are formed due to surrounding of three spheres in same plane whose centres are at corners of a triangle. Coordination number of a particle present in trigonal void = 3

Tetrahedral void (T-voids): These voids are formed due to close packing of one corner atom and three adjacent face-centered atoms in a cubic unit cell. Surrounding spheres are located at the corners of a regular tetrahedron. Coordination number = 4

Octahedral voids (O-voids): These voids are formed due to overlapping of two trigonal voids of adjacent layers. Surrounding spheres are located at the corners of an octahedron. Coordination number = 6

Cubical voids: These voids are formed by close packing of eight corner atoms in a simple cubic unit cell. Coordination number = 8