Question

Q4. Write word equations for the reactions given below:
a) Sulphur dioxide is dissolved in water.
b) Copper vessel is exposed to moist air for a long time. (2)

Answer 1

Explanation:

A) When sulphur dioxide is dissolved in water, then it forms sulphurous acid (H2SO3).

B) When copper vessel is exposed to moist air for a long time it develops a green layer on its surface. Copper corrodes by oxidation in which it reacts with oxygen in the air to form copper oxide. Copper oxide then combines with carbon dioxide to make copper carbonate, which gives it a green colour.