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

In which compound, the oxidation number of oxygen is positive?

1
H2O2
2
Na2O2
3
OF2
4
More than one of the above  
5
None of the above
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