Final answer:
If the mixture of ammonium chloride and zinc chloride paste were to become dry in the zinc can, it would lose its effectiveness.
Step-by-step explanation:
If the mixture of ammonium chloride and zinc chloride paste were to become dry in the zinc can, it would lose its effectiveness. The paste serves as the electrolyte in the zinc-carbon dry cell, facilitating the flow of ions between the anode and the cathode. When the electrolyte dries up, the cell will not be able to generate electrical energy effectively.