Question

From the list given below, choose the metals extracted from their aqueous salt solutions by electrolysis:

Na, Au, Ag, Mg, Ca, Pt, Cu, K, Al, Fe, Ni, Pb, Hg

• A. Na, Mg, Ca, Pt, Cu
• B. Pt, Cu, Al, Pb, Hg
• C. Na, Mg, Ca, K, Al
• D. Au, Ag, Ni, Fe, Hg

Answer 1

The correct option is C Na, Mg, Ca, K, Al

All metals are classified according to their reactivities.
The reactivity series is the arrangement of metals in the decreasing order of their reactivity.
The extraction process for highly reactive elements is done using electrolysis.



Metals which are higher in the electrochemical series, such as potassium, calcium, sodium, magnesium and aluminium, are extracted by electrolysis.