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Question

A. Binary solid A plus B minus has a structure withB minus ions constituting the lattice  and A plus occupied 25% tetrahedral holes formula of solid 

A2B 
AB 
AB2 
AB4 


Solution

Let no. of unit cells = n.
Then , no of tetrahedral voids = 2n × 25% of this
= 2n/4 = n/2.
So the required formula is An/2Bn or AB2 . 

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