Select the correct order of the following metals in terms of their increasing reactivities.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. Au, Cu, Mg and K.
This order represents the increasing reactivity of the metals. Gold (Au) is the least reactive metal, known for its resistance to corrosion and oxidation. Copper (Cu) is more reactive than gold but still relatively stable. Magnesium (Mg) is quite reactive, especially with acids and water. Potassium (K) is the most reactive among them, reacting vigorously with water and oxygen.
Reactivity order (increasing):
Gold (Au) < Copper (Cu) < Magnesium (Mg) < Potassium (K)