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An element R (Atomic weight = 120) having bcc structure has unit cell edge length 400 pm. Identify the INCORRECT Option(s) (Given: $N A = 6 × 1023$ )

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The density of solid element is

6.25 g / c m 3

There are

6 × 1022

unit cells in 24g of R

The atomic radius of R is 1.732

A 0

In 25 g of solid R, the volume occupied by atoms is 2.96

c m 3

answer is D.

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Detailed Solution

4 r = 3 a r = 3 × 100 pm

d = 2 × 120 6 × 1023 × 4 × 10 − 8 3 g / cm 3 = 6.25 g / cm 3

C) 0.1 mol unit cell-2 mol R
0.1 mol unit cell -0.2 mol R
d) 25g is

25 6.25 cm 3 = 4 cm 3

volume occupied by atoms

= 0.68 × 4 cm 3

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