CO3- (2-) Ion: Resonance Structures

[Soaring Crane]

1) The CO3 (2-) ion has a maximum of

a.two resonance structures involving two single bonds and one double bond.

b.two resonance structures involving one single bond and two double bonds.

c.three resonance structures involving one single bond and two double bonds.

d.three resonance structures involving two single bonds and one double bond.

There is 1 O=C bond and 2 O-C bonds, so three exist because anyone (but only one) O can have a double bond?


2) Which one of the following is expected to exhibit resonance?
a.NH4+
b.HCN
c.NO2-
d.CO2

There is 1 O-N bond and 1 O=N bond, so 2 resonance structures exist for nitrite?

3) Assign formal charges (FC) to each atom in the resonance form for SOCl2 described below.

For SOCl2, the central atom S has one single bond with each of the Cl atoms and a one double bond with O exists. A lone electron pair is also by the central atom.

a.0 for Cl, 0 for S, and 0 for O
b.-1 for Cl, -2 for S, and -2 for O
c.-1 for Cl, +4 for S, and -2 for O
d.0 for Cl, +1 for S, and -1 for O

FC_S: 6 - [(1/2)*8 + 2] = 0 ?
FC_Cl: 7 - [(1/2)*2 + 6] = 0 ?
FC_O: 6 - [(/2)*4 + 4] = 0 ?

Thanks.

 

[scott_alexsk]

Try posting it in the Chemistry forum.
-Scott

 

[Gokul43201]

I know this is really late, but for whatever it's worth...all three answers are correct.

And this is the right place for this thread.