Question

Define alloys. List the properties of alloys that makes them useful over pure metals ? Explain these
facts with suitable examples.

CBSE Class X Science SA 2 (3 Marks)

Answer 1

Alloys are homogeneous mixture of two or more metals or a metal and a non-metal that cannot be separated into their components by physical methods.                                                                                                                                    
Properties of alloys are :

(i) The electrical conductivity.

(ii) Melting point of an alloy is less than that of a pure metal.                                       
e.g., Brass and Bronze are not good conductors of electricity whereas copper is used in making

electrical circuit

Answer 2

Alloys are homogeneous mixtures (physical) of two or more metals prepared at a higher temperature by melting or otherwise.  Some non metals may also be added to alter the properties of the alloy prepared.

Alloys have higher toughness, better conductivity, better properties related rusting on the surface and better melting point.  Example Tungsten alloy for filament of a bulb, copper alloy for electrical wire,  stainless steel for numerous applications including containers.