NEET Chemistry The Solid State Questions Solved

BOARD

The unit cell of an element of atomic mass 108u and density 10.5 g cm-3 is a cube with edge length, 409 pm. Find the type of unit cell of the crystal. [Given : Avogadro's constant = 6.023 × 1023 mol-1]

We know that Z = a3ρ×NAM

 Z = (409×10-10)3×10.5×6.023×1023108

409×409×409×10-30×10.5×6.023×1023108

423.68108 = 4

So it forms cubic- closed packed (ccp) lattice or fcc structure.

Difficulty Level:

Crack NEET with Online Course - Free Trial (Offer Valid Till September 17, 2019)