NEET Chemistry The Solid State Questions Solved


A metallic element exists as cubic lattice. Each edge of the unit cell is 2.88 A0. The density of the metal is 7.20 g cm-3. How many unit cell will be present in 100 g of the metal -

(A) 6.85×102                             

(B) 5.82×1023

(C) 4.37×105                             

(D) 2.12×106

(B).  The volume of the unit cell

                         =2.88A03=23.9×10-24cm3

The volume of 100 g of the metal = mρ=1007.20=13.9 cm3

Number of unit cells in this volume

                           =13.9 cm323.9×10-24cm3=5.82×1023

Difficulty Level:

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