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Q.

A solid has a structure in which X-atoms are located at the cube corners of the unit cell, O-atoms are located at the cube edges and the Na-atoms at the cube centres. Lattice is of the type with formula

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a

simple cubic,  Na2XO3

b

tetrahedral, NaXO3

c

body-centred, NaXO3

d

simple cubic, NaXO3

answer is D.

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Detailed Solution

AtomLocationNumber of atom(s)
XCorners8/8 = 1
OEdges 

12×14=3

 

NaBody centre (not shared)     1

Thus, lattice is 

NaXO3 (simple cubic).

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