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Minerals and Its Properties

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Question

Explain if metals truly lose their lustre with time.

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Solution

Metals lose their lusture when exposed to air and moisture for a long time. But if the surface of the dull metal is rubbed and scraped off with sandpaper, lusture is observed.

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Q. Metals have lustre (shine). Give reason why some metal articles become dull and lose their shine after sometime.

Q. Mark the correct statement.
a) Metals lose their lustre on keeping in air.
b) Gold is lustrous.
c) Metals are lustrous and can be polished.

Q. Give reasons:
(a) Metals like

Na, K, Ca

Mg

are never found in their free state in nature.
(b) Iron loses its lustre over time whereas gold does not.

Q. When utensils are washed with hard water, they tend to lose their lustre.

Which of the following options represent correct decreasing order by which the metals: Na, Au, Cu and Mg will lose their lustre when exposed to air?

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