Question

A metal ‘X’ acquires a green colour coating on its surface on exposure to air. (i) Identify the metal ‘X’ and name the process responsible for this change. (ii)Name and write chemical formula of the green coating formed on the metal. (iii) List two important methods to prevent the process.

Answer 1

(i) Metal is copper. The process is corrosion. 

(ii)Basic copper carbonate [CuCO₃.Cu(OH)₂]. 

(iii) 

• It should be coated with tin 

• It should be mixed with other metals to form alloys