Oxygen is always divalent while sulphur can form 2, 4 and 6 bonds because

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Sulphur has vacant d-orbitas while oxygen does not

Sulphur has large atomic radius than oxygen

Oxygen is more electronegative than sulphur

Sulphur is more electronegative than oxygen

answer is B.

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Detailed Solution

Electronic configuration of 'Oxygen' = [He]2s²2p⁴.

Due to the absence of d-orbitals, Oxygen can exhibits a max. covalence '2'

Electronic configuration of 'S' = [Ne]3s²3p⁴3d^o

Due to the presence of empty d-orbitals the configuration is expanded and exhibit a max. covalence '6'

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