Question

All materials shows property of malleability except:
A.Iron
B.graphite
C.aluminum
D.silver

Answer 1

Hint: We must have the knowledge of metal and its properties. Malleability is one such property shown by metals. All of them are metals except one which has lubricant property.

Complete step by step answer:
Elements are broadly classified as metals and non metals. Most of the elements in the periodic table are metals. They are found generally toward the left hand side of the periodic table. Some physical properties of metals are:
They are super shiny or lustrous in nature. They are very good conductors of heat and electricity and generally have high melting point and density. All the metals are solid at room temperature except mercury which exists as liquid at room temperature.
The metals are ductile, that is they can form small wires just like copper, silver iron and gold.
Malleability is the property of metal that means metal can be beaten up into sheets or can form sheets. We have seen sheets of metals are made such as aluminum sheets or foils and silver sheets are used as a decoration on sweets.
All the metals such as iron, silver and aluminum are malleable.
Non metals are those which do not show above mentioned properties, in fact they behave in the opposite manner than that of metals. They are poor conductors of heat and electricity, they are neither malleable nor ductile.
Graphite is a non metal as it shoes all the above properties except conduction.

So it is clear that graphite is not malleable hence, the correct option is B.

Note:
Graphite is an allotrope of carbon, it is purely made out of carbon. It is used in pencils. If subjected to higher pressure and temperature it gets converted into diamond. It is a non metal but shows electrical properties because of the presence of free electrons.