Due to its reactivity, the alkali metal sodium is stored in

Why are noble metals so named?

Which one of the following metals/alloys is used in electric heating elements?

Which one among the following metals is used for making boats because it does not corrode by seawater?

Which of the following metals is used in making the filament of an electric bulb?

Which of the following metals is known to pollute the air of big cities with a large number of vehicles?