Question

Given that $CaTi{O}_3$ has a pervoskite structure, then choose the correct option:

• A. Atoms of oxygen form a simple cubic arrangement.
• B. Atoms of Titanium are present at the edges of the cube
• C. Calcium is located at the corner of the cube.
• D. Atoms of oxygen are present at the face centres of the cube.

Answer 1

The correct option is D Atoms of oxygen are present at the face centres of the cube.

Pervoskite structure :
$\text{General formula is}AB{X}_{3}Eg:CaTi{O}_3$


The central atom A $\left(Ca\right)$ is located at the body centre of the cube.
The B atoms $\left(Ti\right)$ form a simple cubic arrangement.
The X atoms $\left(O\right)$ are at the face centres of the simple cube.
Only option (d) is correct.

$\text{Thus total X atoms}:6\times \frac{1}{2}=3$
$\text{Thus total A atoms}:1$
$\text{Thus total B atoms}:1$