Q.

The data given below is used to find the type of cubic lattice to which the crystal belong.

 AgAlCuNa
a (pm)407.7405361424
(gcm–3 )10.52.78.921.002
At.mass (gm)1082763.523

Which of the above crystallizes in FCC unit cell

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a

Na

b

Ag

c

Cu

d

Al

answer is A, B, C.

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Detailed Solution

ZAg=d.a3NAM=10.5×4.07×1083×6.023×1023108=4ZAl=4.05×1083×2.7×6.023×102327=4ZCu=3.61×1083×8.92×6.023×102363.5=4

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