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J.D. Lee is never wrong :P.. They use the text to teach in IIT, man.. Give some credit to the guy.. Regarding your doubt, You're forgetting that the molecule is not strictly covalent, the OH will exist as O-H+.. So the O- will have an electron donating effect on S, increasing negative charge on it, and thus pushing the S=S shared pairs of electrons away from the central atom. Hence +6, -2..
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