The oxidation number of Platinum (Pt) in PtO2 is _______.

2.
The oxidation number of Chlorine (Cl) in SnCl2 is _______.

:
The oxidation number of Chlorine (Cl) in SnCl2 is _______.

3.
The oxidation number of Beryllium (Be) in BeCl2 is _______.

:
The oxidation number of Beryllium (Be) in BeCl2 is _______.

4.
The oxidation number of Oxygen (O) in Li2O is _______.

:
The oxidation number of Oxygen (O) in Li2O is _______.

5.
The oxidation number of Nitrogen (N) in N2 is _______.

:
The oxidation number of Nitrogen (N) in N2 is _______.

Column B
a.0
b.-1
c.+4
d.+2
e.-2

1. d. +4

2. e. -1
3. d. +2
4. e. -2
5. a. 0