Question

The oxidation number of Al in$Ca_{3}\left( AlO_{3} \right)_{2}$ is

• A.
  • 3
• B. – 1
• C.
  • 2
• D. 0

Answer 1

Answer: (A)

• 3

Answer 2

$Ca_{3}\left( \underline{Al}O_{3} \right)_{2}$

2 × 3 + 2x – 6 × 2 = 0 or $6 + 2x - 12 = 0$ or $2x = 6$

or$x = + 3$