Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Chemistry Chemical Reaction
Oxidation state of oxygen in simple oxides like H2O, Na2O will be ______.
1
-2
2
+2
3
-1
4
More than one of the above
5
None of the above