19. Give the reason why some metals become dull and lose their shine.

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Solution

Metals are lustrous due to which metal has a shiny appearance.
Some metals react with oxygen in presence of moisture and form a dull layer at the surface of the metal.
Hence, due to the formation of dull layer metals loses their shine and become dull.

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19. Give the reason why some metals become dull and lose their shine.

Metals are lustrous due to which metal has a shiny appearance.Some metals react with oxygen in presence of moisture and form a dull layer at the surface of the metal.Hence, due to the formation of dull layer metals loses their shine and become dull.

Metals are lustrous due to which metal has a shiny appearance.
Some metals react with oxygen in presence of moisture and form a dull layer at the surface of the metal.
Hence, due to the formation of dull layer metals loses their shine and become dull.