NEET Chemistry The Solid State Questions Solved

A solid has a bcc structure. If the distance of closest approach between the two atoms is 1.73Å . The edge length of the cell is:

(a) 200pm

(b) 32 pm

(c) 142.2 pm

(d) 2pm

(a) ratom3/4a; Also closest approach in bcc lattice is 1/2 of body diagonal, i.e, 3/4a=1.73Å

or a = 1.73x2/ 3=1.996 Å=199.6pm

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