Question 6A261

The Edison-type storage cell, also known as a nickel-iron battery, uses an alkaline electrolyte and distinct plate materials. The negative plate (anode) of this cell is made from finely powdered pure iron, which oxidizes during discharge to produce electricity. This makes option A correct. Option B, "Green oxide of nickel," refers to nickel compounds, specifically nickel hydroxide, which are used for the *positive* plate (cathode) of an Edison cell, not the negative. Option C, "Potassium oxide," is incorrect because potassium hydroxide (KOH) is used as the *electrolyte* in an Edison cell, not as a plate material. Therefore, since A is correct, D is incorrect.