Question

A metal ‘X’ acquires a green colour coating on its surface on its exposure to air.
a) Identify the metal ‘X’ and name the process responsible for this change.
b) Name and write the chemical formula of the green coating formed on the metal.
c) List 2 important methods to prevent the process

Answer 1

a) The metal X is copper and process which is responsible for this change is called as corrosion.

b) Name of the compound is copper carbonate and chemical formula is :-

2Cu + H2O + CO + O2 = CuCO3.Cu(OH)2

|____________| |____________|

Present in air CopperCarbonate

(green coating)

c) • It should be coated with tin.

• It should be mixed with other metals to form alloys.

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