# NEET Chemistry The Solid State Questions Solved

At room temperature, sodium crystallises in a body centred cubic cell with a 4.24 $\stackrel{0}{A}$. The theoretical density of sodium is- (Atomic mass of sodium=23.0 g $mo{l}^{-1}$)

(A)

(B)

(C)

(D)

(C). The value of Z for a bcc unit cell is 2.

Volume V=${\left(4.24A\right)}^{3}$

$\therefore \rho =\frac{ZM}{NV}=\frac{2×23}{\left(6.023×{10}^{23}\right)×{\left(4.24×{10}^{-8}\right)}^{3}}=1.00g/c{m}^{3}$

Difficulty Level:

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