Question

Metal X becomes green when left in air, turns black when heated in air. Name the metal and compounds formed in both the cases.

Answer 1

The metal X is copper (Cu)

When left in air copper turns green by reacting with oxygen in air forming compound Cu(OH)2 that is copper hydroxide

When it is heated in air it forms copper oxide (CuO) that is black in color

Answer 2

Answer:

Copper is metal which becomes green when left in air, turnsblack when heated in air