In a binary compound, atoms of element A

Question:

In a binary compound, atoms of element $\mathrm{A}$

form a hcp structure and those of element $\mathrm{M}$

occupy $2 / 3$ of the tetrahedral voids of the hep structure. The formula of the binary compound is:

  1. $\mathrm{M}_{2} \mathrm{~A}_{3}$

  2. $\mathrm{M}_{4} \mathrm{~A}_{3}$

  3. $\mathrm{M}_{4} \mathrm{~A}$

  4. $\mathrm{MA}_{3}$ Official Ans. by NTA (2)


Correct Option: , 2

Solution:

$\mathrm{M}_{12 \times \frac{2}{3}} \mathrm{~A}_{6}$

$\mathrm{M}_{8} \mathrm{~A}_{6}$

$\mathrm{M}_{4} \mathrm{~A}_{3}$

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