* loss of electrons.
* loss of hydrogen.
* gain of oxygen
1) Al gets oxidized.
2) S in H2S gets oxidized
3) Si gets oxidized
in the very first reaction S with +4 oxidation state in H2SO3 will get oxidized to H2SO4 with +6 oxidation state.
in the other reaction you have asked, S has -2 oxidation state and it oxidizes to S with 0 (zero) oxidation state.
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