What is the reactivity series and why is it important?

The reactivity series ranks metals from most reactive (Potassium) to least reactive (Gold): K>Na>Ca>Mg>Al>Zn>Fe>Ni>Sn>Pb>H>Cu>Hg>Ag>Au. It is important because: (1) A more reactive metal displaces a less reactive metal from its salt solution (displacement reactions), (2) It determines the method of extraction, (3) It predicts which metals react with dilute acids.

Why are some metals extracted by electrolysis?

Highly reactive metals (K, Na, Ca, Mg, Al) are at the top of the reactivity series and have very strong bonds with oxygen/other elements. Carbon reduction cannot reduce these oxides because carbon is not reactive enough. Electrolysis provides electrical energy to overcome the strong bond and extract the pure metal.

What is the difference between malleability and ductility?

Malleability: ability of a metal to be beaten into thin sheets (e.g., gold foil). Gold is the most malleable metal. Ductility: ability of a metal to be drawn into thin wires (e.g., copper wire). Both are physical properties of metals that non-metals do not possess (non-metals are brittle).

Properties of Metals and Non-Metals

Metals and Non-Metals • Class 10 Science • NCERT • CBSE

Metals are lustrous, ductile, malleable solids that conduct electricity and heat. Non-metals are dull, brittle, and poor conductors. Metals react with oxygen to form basic oxides, while non-metals form acidic oxides. The reactivity series ranks metals from most to least reactive.

Key Formulas

Metal + O₂ → Metal Oxide (basic)
Metal + Dilute Acid → Salt + H₂
Reactivity: K > Na > Ca > Mg > Al > Zn > Fe > Ni > Sn > Pb > H > Cu > Hg > Ag > Au
Electrolytic refining: impure anode → pure cathode

Frequently Asked Questions

What is the reactivity series and why is it important?: The reactivity series ranks metals from most reactive (Potassium) to least reactive (Gold): K>Na>Ca>Mg>Al>Zn>Fe>Ni>Sn>Pb>H>Cu>Hg>Ag>Au. It is important because: (1) A more reactive metal displaces a less reactive metal from its salt solution (displacement reactions), (2) It determines the method of extraction, (3) It predicts which metals react with dilute acids.
Why are some metals extracted by electrolysis?: Highly reactive metals (K, Na, Ca, Mg, Al) are at the top of the reactivity series and have very strong bonds with oxygen/other elements. Carbon reduction cannot reduce these oxides because carbon is not reactive enough. Electrolysis provides electrical energy to overcome the strong bond and extract the pure metal.
What is the difference between malleability and ductility?: Malleability: ability of a metal to be beaten into thin sheets (e.g., gold foil). Gold is the most malleable metal. Ductility: ability of a metal to be drawn into thin wires (e.g., copper wire). Both are physical properties of metals that non-metals do not possess (non-metals are brittle).

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