Can someone please help me and check-over my answers to these two Chemistry problems?

Question

Group 1A metals always have an oxidation number of _______ in molecules that contain more than one type of atom.

A. –2

B. –1

C. 0

D. +1

E. +2

 Group 2A metals always have an oxidation number of _______ in molecules that contain more than one type of atom.

A. –2

B. –1

C. 0

D. +1

E. +2

Answer 1

Yes, that is correct. It should be one of the first Oxidation Number rules: When reacted, the state of IA, IIA, and Al are +1, +2, and +3 respectively. (This dominates over any other Ox No. rules). Atoms have ox no. of 0 when unreacted with other elements.

Na₂O₂ Oxygen rule is that O is pretty dominant that it has a reacted state of -2, but the Na must be +1, meaning that the O must be in a -1 state to balance the overall Ox No. charge. This is the peroxide state: O₂^2-

Hydrogen is dominant over O (in terms of Ox No. ) as is fluorine (OF₂ O is in +1 state)