Which of the following chemical equations represents a process where NO change in the oxidation states of the reacting species occurs?

Step-by-step solution

In option (A), the oxidation state of Mn changes from +4 in MnO ₂ to +2 in MnCl ₂ , and Cl changes from -1 in HCl to 0 in Cl ₂ . This is a redox reaction. In option (B), the oxidation state of Na changes from 0 to +1 in NaOH , and H changes from +1 in H ₂ O to 0 in H ₂ . This is a redox reaction. In option (C), the oxidation state of P changes from 0 in P ₄ to -3 in PH ₃ and +1 in NaH ₂ PO ₂ . This is a disproportionation (redox) reaction. In option (D), the oxidation states of the elements are: Ag : +1 in AgNO ₃ a