Explain why the surfaces of some metals become dull when exposed to air for sometime.

The shining surface of some metals becomes dull when exposed to air for a long time.

Explain why surface of some metals acquired a dull appearance when exposed to air for a long time.

Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.

(a) Give reasonwhy copper is used to make hot water tanksbut steel (an alloy of iron) is not. (b). Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.

(a) Which of the following metals would give hydrogen when added to dilute hydrochloride acid (i) iron (ii) copper (iii) magnesium ? (b) Explain why do surfaces of some metals acquire a dull appearance when exposed to air for a long time.

Why NO become brown when exposed in air?

Why do some metals acquire a dull appearance on exposure to air for a long time ?

Why pellets of potassium hydroxide become wet when exposed to air

Which Gr-2 metal burns readily when exposed to air?