Multiple choice

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

  1. P3Q4

  2. P4Q3

  3. P2Q3

  4. P3Q2

  5. PQ
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B Correct answer
Explanation

The number of tetrahedral voids formed is equal to twice the number of atoms of element Q and only 2 / 3rd of these are occupied by the atoms of element P. Hence, the ratio of the number of atoms of P and Q is 2 × (2 / 3) : 1 or 4 : 3 and the formula of the compound is P4Q3.

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