The hybridization state for the central carbon in this molecule is $sp$.
Work Step by Step
1. Find the number of bonded atoms. - There is 2 oxygens : 2 atoms. 2. Find the number of lone pairs. - The central carbon doesn't have lone pairs. 3. The hybridization state number will be the sum of these numbers minus 1. 2 + 0 = 2 2 - 1 = 1 - Therefore, the hybridization state is $sp^1 = sp$