1. хлорная
H+1CxO4 −2
+1 + x + (-2) • 4 = 0
1 + x − 8 = 0
x = +7
H+1Cl+7O4−2
2.
хромовая
H2+1CrxO4−2
+1 • 2 + x + (− 2) • 4 = 0
2 + x − 8 = 0
X = +6
H2+1Cr+6O4−2
3.
двухромовая
H2+1Cr2xO7 − 2
+1 • 2 + x • 2 + (−2) • 7 = 0
2 + 2x − 14 = 0
2x = +12
x = + 6
H2+1Cr2+6O7 −2
4.
азотистая
H+1NxO2 −2
+1 + x + (−2) • 2 = 0
1 + x − 4 = 0
x = +3
H+1N+3O2 −2
5.
пирофосфорная
H4+1P2xO7 −2
+1 • 4 + x • 2 + (−2) • 7 = 0
4 + 2x −14 = 0
2x = +10
x = +2
H4+1P2+5O7 −2