Final answer:
The oxidation numbers of P, S, and Cl in H2PO2–, H2S, and KClO4 are +1, -2, and +7 respectively.
Step-by-step explanation:
The oxidation numbers of P, S, and Cl in H2PO2–, H2S, and KClO4 are, respectively:
- In H2PO2–, the oxidation numbers are: P = +1, O = -1
- In H2S, the oxidation numbers are: S = -2, H = +1
- In KClO4, the oxidation numbers are: K = +1, Cl = +7, O = -2
These oxidation numbers are determined by assigning electrons based on certain rules and guidelines. It is important to note that oxidation numbers represent the hypothetical charge that an atom would have if all the bonds in the compound were purely ionic.