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Which of the following property is gener...

Which of the following property is generally not shown by metals? 

A

Electrical conduction

B

Sonorous in nature

C

Dullness

D

Ductility

Text Solution

Verified by Experts

The correct Answer is:
C
A metal has a shining surface only when it is fresh. The metals lose their shine or brightness on keeping in air for a long time and acquire a dull appearance due to the formation of a thin layer of oxide, carbonate or sulphide on their surface.
 If we rub the dull surface with a sand paper, the metal objects becomes shiny and bright once again.
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Knowledge Check

  • Which one of the following properties is not shown by NO?

    A
    It is diamagnetic in gaseous state
    B
    it is neutral oxide
    C
    it combines with oxygen to form nitrogen dioxide
    D
    it's bond order is 2.5

  • Which one of the following properties is not shown by NO?

    A
    It is diamagnetic in gaseous state
    B
    It is neutral oxide
    C
    It combines with oxygen to form nitrogen dioxide
    D
    It's bond order is 2.5

  • Which of the following properties is not shown by NO ?

    A
    Its bond order is 2.5
    B
    It is diamagnetic in the gaseous state.
    C
    It is a neutral oxide.
    D
    It combines with oxygen to form nitrogen dioxide.

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