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Question
In a cubic structure of compound which is made from X andY, where X atoms are at the corners of the cube andY at the face centres of the cube. The molecular formula of the compound is
In a cubic structure of compound which is made from X andY, where X atoms are at the corners of the cube andY at the face centres of the cube. The molecular formula of the compound is
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Solution
The correct option is D
X atoms are at eight corners of the cube. Therefore, the number of X atoms in
the unit cell 
Y atoms are at the face centre of six faces. Therefore, its share in
the unit cell 
. The formula is 
X atoms are at eight corners of the cube. Therefore, the number of X atoms in
the unit cell
Y atoms are at the face centre of six faces. Therefore, its share in
the unit cell . The formula is