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Uses of Metals and Alloys Properties

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Questions and Answers

Why is aluminium used in the manufacture of aircraft?

Because of its ductility

Because of its good electrical conductivity

Because of its low density (correct)

Because of its resistance to corrosion

What is the main reason for using aluminium in the manufacture of overhead electrical cables?

High melting point and malleability

Good electrical conductivity and ductility

Resistance to corrosion

Low density and good electrical conductivity (correct)

Why is stainless steel used in cutlery?

Hardness and resistance to rusting (correct)

Good electrical conductivity and ductility

Low density and good electrical conductivity

Resistance to corrosion

What makes alloys harder and stronger than pure metals?

Different sized atoms or ions prevent layers from sliding over each other Signup and view all the answers

What is brass a mixture of?

Copper and zinc Signup and view all the answers

What is the primary reason for using copper in electrical wiring?

Good electrical conductivity and ductility Signup and view all the answers

What is the main reason behind the apparent unreactivity of aluminium?

Formation of a protective oxide layer Signup and view all the answers

Which of the following metals will react with dilute hydrochloric acid?

Zinc Signup and view all the answers

Which barrier method prevents rusting by excluding oxygen or water?

Painting Signup and view all the answers

What is the primary function of sacrificial protection in preventing corrosion of metals?

Sacrificing the more reactive metal to protect the less reactive metal Signup and view all the answers

What determines the relative reactivities of metals in displacement reactions?

Position in the reactivity series Signup and view all the answers

From the given reactivity series, which metal is most likely to react vigorously with cold water?

Sodium Signup and view all the answers