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AP EAMCET · Chemistry · Solid State

In a \(A_x B_y\) crystal structure, \(A^{+y}\) ions occupy all the tetrahedral voids and \(\mathrm{B}^{-\mathrm{x}}\) ions make \(\mathrm{BCC}\) unit cell: What is the formula of the compound?

  1. A \(\mathrm{A}_4 \mathrm{~B}_2\)
  2. B \(\mathrm{A}_2 \mathrm{~B}_4\)
  3. C \(\mathrm{A}_2 \mathrm{~B}_2\)
  4. D \(\mathrm{A}_4 \mathrm{~B}_4\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(\mathrm{A}_4 \mathrm{~B}_2\)

Step-by-step Solution

Detailed explanation

Number of \(\mathrm{A}^{+\mathrm{y}}\) ions \(=2 \times\) number of atoms per unit cell. Number of \(\mathrm{B}^{-\mathrm{x}}\) ions \(=2(\mathrm{BCC})\) per unit cell. \(\Rightarrow\) Number of \(\mathrm{A}^{+\mathrm{y}}\) ions \(=2 \times 2=4\) \(\Rightarrow\) Formula…