NEET Chemistry The Solid State Questions Solved


Lithium borohydride (LiBH4), crystallises in an orthorhombic system with 4 molecules per unit cell. The unit cell dimensions are : a = 6.81 Å, b = 4.43 Å, c = 717 Å. If the molar mass of LiBH4 is 21.76 g mol-1. The density of the crystal is-

(A) 0.668 g cm-3                                         

 (B) 0.585 g cm2

(C) 1.23 g cm-3                                           

 (D) None of these 

(A). We know that, ρ=ZMNV

4×21.76 g mol-16.023×1023mol-16.81×4.43×7.17×10-24cm3

0.668 g cm-3

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