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

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Question : 42
Total: 50
A compound is formed by two elements M and N. The element N forms ccp and atoms of M occupy 1/3rd of tetrahedral voids. What is the formula of the compound?
Solution:  
Suppose no. of atoms of element N = a
Number of tetrahedral voids = 2a
Number of atoms of element M=×
1
3
×2a
=
2a
3

Ratio of M and N =
2a
3
:a=2
:3

Formula of the compound =M2N3
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