Hybridization of ‘S’ is number of atomic orbitals involved in hybridization = 1/2 (no. of e- in outer most shell + no. of e- in σ bonds – no. of e- in π bonds)= 1/2(6 + 1 - 1) = 3. Out of the three orbitals, one is s and two are p-orbitals, hence the hybridization os ‘S’ is sp2.