Question

The figure below shows a unit cell of the mineral perovskite (the titanium atom is at the centre of the cube). Which of the following is a correct chemical formula for this mineral?

• A. $Ca _{8} TiO _{6}$
• B. $CaTiO$
• C. $Ca _{2} TiO _{3}$
• D. $CaTiO _{3}$

Answer 1

Answer: (D)

Effective number of $C a=8 \times \frac{1}{8}=1$

Effective number of $Ti =1 \times 1=1$

Effective number of $O=6 \times \frac{1}{2}=3$

$\therefore $ Formula $= CaTiO _{3}$