What do disposable batteries use?

What do disposable batteries use?

• A. Lithium and cobalt in electrolyte
• B. Carbon and zinc submerged in sulfuric acid
• C. Copper and aluminum in water
• D. Nickel and cadmium in nitric acid

Answer: (B)

Disposable batteries are built as simple zinc–carbon electrochemical cells. In these cells, zinc acts as the anode and oxidizes, releasing electrons, while a carbon rod serves as the cathode where reduction occurs. The electrolyte, often a mildly acidic paste that enables ion movement, completes the circuit and allows the chemical reactions to generate electrical energy. Because this chemistry is designed for a one-time chemical reaction, these batteries are not rechargeable. The other options describe chemistries used in different battery types (like lithium-ion or nickel–cadmium) and don’t match the common zinc–carbon disposable design, which is why the carbon and zinc combination is the correct fit.

Disposable batteries are built as simple zinc–carbon electrochemical cells. In these cells, zinc acts as the anode and oxidizes, releasing electrons, while a carbon rod serves as the cathode where reduction occurs. The electrolyte, often a mildly acidic paste that enables ion movement, completes the circuit and allows the chemical reactions to generate electrical energy. Because this chemistry is designed for a one-time chemical reaction, these batteries are not rechargeable. The other options describe chemistries used in different battery types (like lithium-ion or nickel–cadmium) and don’t match the common zinc–carbon disposable design, which is why the carbon and zinc combination is the correct fit.