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Question: Answered & Verified by Expert
In $\mathrm{HCP}$ of $A, \frac{1}{3}$ of tetrahedral voids are occupied by $B$. What is the formula of the compound?
ChemistrySolid StateAIIMSAIIMS 2018 (26 May)
Options:
  • A $A_2 B_3$
  • B $A_3 B_2$
  • C $A B_3$
  • D $A_2 B$
Solution:
1719 Upvotes Verified Answer
The correct answer is: $A_3 B_2$
No. of atoms $(A)=6(h c p)$,
no. of $B$ atoms $=\frac{1}{3} \times 12=4$
Hence, the formula of the compound is $A_6 B_4$ or $A_3 B_2$.

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