Multiple choice

Atoms of element B form hcp lattice and those of the element A occupy 2/3rd of tetrahedral voids. What is the formula of the compound formed by the elements A and B?

  1. A3B4

  2. A4B3

  3. A2B3

  4. A3B2

  5. AB

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The number of tetrahedral voids formed is equal to twice the number of atoms of element B and only 2/3rd of these are occupied by the atoms of element A. Hence, the ratio of the number of atoms of A and B is 2 × (2/3):1 or 4:3 and the formula of the compound is A4B3.