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Q.

The body centred cubic cell of chromium has a length of 0.288 nm. Calculate the density of chromium (g/cm3) : (Atomic weight : Cr = 52.0)

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a

7.26

b

6.80

c

7.60

d

6.60

answer is D.

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Detailed Solution

d = ZM/ a3N ; z = 2, M = 52, a = 0.288×10–7

d=2×52(288×10-10)3×6.02×1023

d = 7.26 gm /cc

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