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CsBr crystallises in a body centred cubic lattice. The unit cell length is 436.6 pm. Given that the atomic mass of Cs = 133 and that of Br = 80 amu and Avogadro number being =

6.023 x 1023  mol -1  CsBr. the density of CsBr is

a. 8.25 g/ cm3

b. 4.25 g/cm3

c. 42.5g /cm3

d. 0.425g / cm3

Ans. b

(41)

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