Question

Determinar valencias
1. H2CO3
2. KMnO4
3. K2Cr2O7
4. Ca(OH)2
5. Pb(NO3)2

Answer 1

1:
H: +1
C: +4
O: - 2

2.
K: +1
Mn: +7
O: -2

3.
K: +1
Cr: +6
O: - 2

4.
Ca: +2
O: - 2
H: +1

5.
Pb: +2
N: +5
O: -2