Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test Chemistry

In which of the following does sulphur have an oxidation number of +4?

1
\(\rm HSO^-_3\)
2
SO3
3
H2SO4
4
More than one of the above
5
None of the above
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