# NEET Chemistry The Solid State Questions Solved

Lithium borohydride ($LiB{H}_{4}$), 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 $LiB{H}_{4}$ is 21.76 g $mo{l}^{-1}$. The density of the crystal is-

(A)

(B)

(C)

(D) None of these

(A). We know that, $\rho =\frac{ZM}{NV}$

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