The physical properties of Si02 and CO2 are different because?

Question

C can make pi-bonds to O, but Si cannot.
Si can use d-orbitals to bond to O, but C cannot.
Si is more electronegative than C.
The C-O bond is more polar than the Si-O bond.
All of the above

Answer 1

Si can use d-orbitals to bond to O, but C cannot.