H2s acts only as reducing agent while acts as an oxidising as well as a reducing agent why
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The oxidation state of sulfur in H2S is -2 whereas in case of SO2 it is +4.The minimum and maximum oxidation state of sulfer is -2 and and +6.Thus for H2S it can only reduce or donate electron whereas in case of sulfurdioxide it can change its oxidation number either from +4 to-2(reduction) and +4 to+6 (oxidation)
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