## Question

### Solution

Correct option is

144.17 pm

Mass of unit cell containing four atoms

= 1.31 × 10-21 g/unit cell

= 6.78 × 10-29 m3

Volume,     V = a3

= 407.76 pm

= 144.17 pm

Alternative

a = 407.8 × 10-10 m

= 407.8 pm

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