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  4. The oxidation number of sulphur in S8 , S2F2, H2S respectively, are

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Q. The oxidation number of sulphur in $S_8 , S_2F_2, H_2S$
respectively, are

IIT JEEIIT JEE 1999Some Basic Concepts of Chemistry

Solution:

In $S_8$, oxidation number of $S$ is $0$, elemental state.
In $S_2F_2$, $F$ is in $- 1$ oxidation state, hence $S$ is in $+ 1$ oxidation state.
In $H_2S, H$ is in $+1$ oxidation state, hence $S$ is in $- 2$ oxidation state.