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X-ray diffraction studies show that edge...

X-ray diffraction studies show that edge length of a unit cell of NaCl is 0.56 nm. Density of NaCl was found to be `2.16g//"cc".` What type of defect is found in the solid? Calculate the percentage of `Na^(+)` and `Cl^(-)` ions that are missing.

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The correct Answer is:
(a) 2.18 gm/cc (b) 0.734%
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