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Which of the following statement is not true about the exceptional properties of non - metal?
1. Diamond is having high melting and boiling point.
2. Iodine is having lustrous appearance. 
3. Graphite is the hardest known substance.
4. Both (2) and (3)

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Correct Answer - Option 3 : Graphite is the hardest known substance.

Concept:

Physical Properties Metals Non - Metals
Electrical Conductivity Metals are good conductors of electricity. Non -Metals are poor conductors of electricity. 
Sonorous Metals are sonorous which means the ringing sound is produced when they are hit. Non -metals are non-sonorous.
Malleability Metals can be converted into thin sheets and hence are malleable.  Non - metals cannot be converted into thin sheets and hence are non Malleable.
Ductility Metals can be drawn into thin wires. Non -metals cannot be drawn into thin wires and hence are non - ductile. 
High melting and Boling point Metals have high melting and boiling point. They are usually solid at room temperature.  Non - metals are having low melting point and boiling point. They can be solid, liquid or gas at room temperature. 
 

 

Few exceptions to the Physical Properties

  • Some metals and non - metals show physical properties different from their category. 
    • For example, Gallium is having a low melting point despite being a metal. 
    • The diamond which actually Carbon is a non - metal. 

Explanation:

  • Diamond is having high melting and boiling point is true. Also, it is one of the hardest known substances. 
  • Iodine is having a lustrous and shiny appearance though it is non - metal.
  • Graphite is good conductor of electricity but it is soft as non - metal.
  • So, graphite is not hard. 

So, the correct option is 'Graphite is one of the hardest known substance.'

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