Question

Explain the Reactivity Series of metals and its importance in extraction.

Hint:

The reactivity series arranges metals in decreasing order of reactivity. It helps determine the method of extraction of metals: electrolysis for highly reactive metals, reduction with carbon for moderately reactive metals, and simple purification for least reactive metals.

Answer 1

Concept: The reactivity series is a list of metals arranged in the decreasing order of their chemical reactivity. It shows the tendency of metals to lose electrons and form positive ions. The position of a metal in this series helps determine how easily it reacts with other substances and also indicates the method used for its extraction from ores.
Step 1:Reactivity Series of Metals.
The reactivity series arranges metals from the most reactive to the least reactive. A commonly used reactivity series is: \[ K, Na, Ca, Mg, Al, Zn, Fe, Pb, Cu, Hg, Ag, Au \]

• Metals at the top of the series are highly reactive.
• Metals in the middle show moderate reactivity.
• Metals at the bottom are least reactive and are often found in the native state.

Step 2:Importance in Extraction of Metals.
The position of a metal in the reactivity series determines the method used for its extraction from ores.

• Highly reactive metals (such as potassium, sodium, and calcium) cannot be extracted by heating with carbon. They are extracted by electrolysis of their molten compounds.
• Moderately reactive metals (such as zinc, iron, and lead) are extracted by reduction with carbon or carbon monoxide.
• Least reactive metals (such as copper, silver, and gold) are often found in native form and may require only simple purification methods.

Step 3:Other Significance of the Reactivity Series.
The reactivity series also helps to:

• Predict the ability of a metal to displace another metal from its compound.
• Understand corrosion and rusting processes.
• Determine the reactivity of metals with water, acids, and oxygen.

Thus, the reactivity series is an important tool in metallurgy and chemical reactions involving metals.