NEET Chemistry The Solid State Questions Solved


A metallic element exists as cubic lattice. Each edge of the unit cell is 2.88 Å. The density of the metal is 7.20 gcm-3. How many unit cell will be present in 100g of the metal-

(A) 6.85 x 102

(B) 5.82 x 1023

(C) 4.37 x 105

(D) 2.12 x 106

(B) The volume of the unit cell = (2.88 Å)3 = 23.9x10-24cm3

The volume of 100g of the metal = m/ρ = 100/7.20 = 13.9cm3

Number of unit cells in this volume = 13.9/23.9x10-24 cm3= 5.82x1023

Difficulty Level:

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