Final answer:
Without a phase diagram or temperature information, it is not possible to definitively determine the phase presence in a 64 wt% Zn - 36 wt% Cu alloy. Redox reactions between Zn and Cu suggest possible phase separation, but more details are needed to answer accurately.
Step-by-step explanation:
The question relates to a 64 wt% Zn - 36 wt% Cu alloy and is asking about the phases present in this alloy composition. In the case of a Zn-Cu alloy, depending on the temperature and composition, different phases can exist based on the phase diagram for the system. However, based on the provided scenarios exploring reactions between zinc and copper, it seems implicit that phase separation could occur under certain conditions. For instance, when a zinc rod is inserted into a copper(II) sulfate solution, a spontaneous reaction leads to the formation of metallic copper, indicating that redox reactions favor the reduction of copper ions to copper metal (Cu) while converting metallic zinc (Zn) to zinc ions (Zn²+).
Therefore, for the specific question of selecting the phases in a 64 wt% Zn - 36 wt% Cu alloy, without additional information such as temperature or the part of the Zn-Cu phase diagram in question, it is not possible to definitively answer the question. If the temperature is below the eutectoid temperature and above the solubility limit for the given composition, it is possible that both Zn and Cu phases could coexist in this alloy (option C). However, without a phase diagram or specific temperature, we cannot confirm the phase constitution for this specific alloy composition. At equilibrium, if the alloy constituents are fully miscible, one might not observe phase separation (option D).