Solid State Question 35
Question: The pyknometric density of sodium chloride crystal is $ 2.165\times 10^{3}kg{{m}^{-3}} $ while its X-rays density is $ 2.178\times 10^{3}kg{{m}^{-3}} $ . The fraction of unoccupied sites in sodium chloride crystal is
[CBSE PMT 2003]
Options:
A) $ 5.96\times {{10}^{-3}} $
B) $ 5.96 $
C) $ 5.96\times {{10}^{-2}} $
D) $ 5.96\times {{10}^{-1}} $
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Answer:
Correct Answer: A
Solution:
Difference $ =2.178\times 10^{3}-2.165\times 10^{3} $
$ =0.013\times 10^{3} $
Fraction unoccupied $ =\frac{0.013\times 10^{3}}{2.178\times 10^{3}} $
$ =5.96\times {{10}^{-3}} $
BETA
