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Select the correct statement(s) for the rock-salt structure (NaCl) 

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By Expert Faculty of Sri Chaitanya
a
The tetrahedral voids are smaller than the octahedral sites
b
The octahedral voids are occupied by cations and the tetrahedral sites are empty
c
The radius ratio (rc/ra) is 0.225
d
the radius ratio (rc/ra) is 0.732

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detailed solution

Correct option is A

sodium chloride crystal has the radius ratio of 0.52


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The structure of MgO is similar to rock salt structure. What is the co-ordination number of Mg?

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