Question

What is the state of hybridisation of carbon in (a) $C{O}_3^{-2}$ (b) diamond (c) graphite?

Answer 1

(a) In carbonate ion, the carbon atom is $s{p}^2$ hybridized and forms pi bond.
(b) In diamond, carbon atom is $s{p}^3$ hybridized and has tetrahedral geometry.
(c) In graphite, carbon atom is $s{p}^2$ hybridized.