Question

Q23. What happens when a copper vessel is exposed to moist for long time? Write word
equation of the reaction.​

Answer 1

Required Answer:-

Copper is comparatively less reactive but reacts with reagents like oxygen and water in atmosphere in a slow time. Also carbon dioxide helps in the reaction. As it is a metal, it will start corroding$.$

After some days, we will observe greenish layer on the surface of copper vessel due to the formation of copper carbonate. The required reaction is:

• Copper when reacts with carbon dioxide, water and oxygen forms basic copper carbonate.

${ \boxed{ \rm{2Cu + CO_2 + O_2 + H_2O \longrightarrow CuCO_3.Cu_(OH)_2}}}$

The basic carbonate is a green coloured substance formed due time. Another example is the statue of liberty in New York, USA.

Answer 2

Copper forms a green deposit on its surface when exposed to air which is usually a mixture of copper carbonate and copper hydroxide.

Chemical reaction is:-

2Cu + H2O + CO2 + O2 → Cu(OH)2 + CuCO3