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NCERT Class XII Chemistry
Chapter - The Solid State
Questions with Solutions

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Question : 12 of 50
Marks: +1, -0
A cubic solid is made of two elements P and Q. Atoms of Q are at the corners of the cube and P at the body-centre. What is the formula of the compound? What are the coordination numbers of P and Q ?
Solution:  
As atoms Q are present at the eight corners of the cube, therefore number of atoms of Q in the unit cell =18×8=1\frac{1}{8} \times 8 = 1
As atoms P are present at the body-centre, therefore, number of atoms of PP in the unit cell = 1
Hence, the formula of the compound is PQPQ.
Coordination number of each of PP and QQ = 8
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