Free elements such as Al and O2 have an oxidation number of 1.

Question

2.
In most compounds, Hydrogen has an oxidation number of +1.

:
In most compounds, Hydrogen has an oxidation number of +1.

3.
Group 1A metals have an oxidation number of -1 in compounds.

:
Group 1A metals have an oxidation number of -1 in compounds.

4.
In compounds, Oxygen has an oxidation number of +2.

:
In compounds, Oxygen has an oxidation number of +2.

5.
Group 2A metals have an oxidation number of +2 in compounds.

:
Group 2A metals have an oxidation number of +2 in compounds.

6.
Group 7A nonmetals have an oxidation number of -1 in compounds.

:
Group 7A nonmetals have an oxidation number of -1 in compounds.

Column B
a.True
b.False

Answer 1

a.True
b.False
c.True
d.True
e.True
f.True