Question 27

Which of the following statement are correct about $C O_{3}^{- 2}$ ?

(a) The hybridisation of central atom is $s p^{3}$

(b) Its resonance structure has one C - O single bond and two C = 0 double bonds

(c) The average formal charge on each oxygen atom is 0.67 units

(d) All C - O bond lengths are equal

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Solution

Answers:

(c) The average formal charge on each oxygen atom is 0.67 units

(d) All C - O bond lengths are equal

The hybridisation of the central atom in $C O_{3}^{2 -} i s s p^{2}$ . Hence, (a) is wrong.

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

Formal charge on each O-atom = $\frac{t o t a l c h a r g e}{N u m b e r o f O - a t o m s} = \frac{- 2}{3} = - 0.67 u n i t s$ .

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

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The correct statement/s about borax is/are:

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(d) +0.75

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