Ncert Exercises & Solutions

Which of the following statements are correct about ${CO}_{3}^{2 -}$ ?

1. The hybridisation of central atom is sp³

2. Its resonance structure has one C-O single bond and two C=O double bonds

3. The average formal charge on each oxygen atom is 0.67 units

4. All C-O bond lengths are equal

(c, d)

The hybridisation of central atom in

{CO}_{3}^{2 -}

is sp². Hence, (a) is wrong.

Due to resonance all C-O bond lengths are equal.

Formal charge on each O-atom

= \frac{total charge}{Number of O - atoms} = \frac{- 2}{3} = 0.67 units .

All C-O bond lengths are equal as mentioned above.