Final answer:
An ore is a naturally occurring mineral deposit from which metals can be profitably extracted. Metals are arranged in increasing reactivity as Au, Cu, Pb, Sn, Fe, Zn, Al, Mg, Ca, Na. Option B is correct.
Step-by-step explanation:
Definition of an Ore and Metal Reactivity Order
An ore is a natural occurrence of rock or sediment that contains sufficient minerals with economically important elements, typically metals, that can be extracted from the deposit economically. The metals can be arranged in order of increasing reactivity as follows: Au (least reactive), Cu, Pb, Sn, Fe, Zn, Al, Mg, Ca, Na (most reactive).
Metals Extracted by Electrolysis
Magnesium, while more reactive than zinc, is generally isolated through chemical reduction rather than electrolysis. However, electrolysis is an important method for the production of sodium, potassium, and aluminum from their ores due to their high reactivity. For example, aluminum is obtained by the electrolytic reduction of aluminum oxide (bauxite) in molten cryolite.
The common ore of aluminum is bauxite, which contains impurities like iron oxides, silicon dioxide, and titanium dioxide.