TS EAMCET 10-Sep-2020 Shift 1 Solved Paper

Given, copper crystallises in ccp manner
radius =1.41Å=141pm
Atomic weight of copper =64
Avogadro's number =6×1023, Density =?
ρ=‌

Z×M

a3×Na

Here, edge length of unit cell can be calculate as
r=‌

a

2√2

⇒a=r×2√2
a=141×2×1.414
a=398.74pm or 398.74×10−10cm
Volume of unit cell =(398.74×10−10cm)3
For ccp=2=4,
Na=6.0×1023
f=6.73≈6.67
Hence, option (a) is correct.