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Q.

A certain elements crystallizes in a bcc lattice of unit edge length 27A. If the same element under the same conditions crystallizes in the fcc lattice, the edge length of the unit cell in A will be…… (Round off to the Nearest Integer).

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answer is 33.

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Detailed Solution

In bcc, r=3a4⇒r=3×274=11.68 In fcc,a=2r2⇒a=2×11.68×1.414=33A0

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