Question

Metals are said to be shiny.why do metals s generally appear to be dull?how can their brightness be restored??

Answer 1

Metals lose their shiny nature when they react with other materials in the environment. The metals form tarnish or rust, which a compound of the metal and other elements such as oxygen or sulphur. This is the reason why, with time, metals lose their shiny nature.
To remove the tarnish or rust you can use the following methods to restore the shininess:
-Scouring with materials such as steel wool.
-Scrubbing with salt based scrub
-Scouring with flour based scrub
-Boiling in a solution of salt and vinegar.