Carbon dioxide reacts with calcium hydroxide to produce a salt and water.

Metallic oxides are described as basic oxides due to their ability to react with acids to produce salts and water.

The general reaction between a metal oxide and an acid is the formation of a salt and water.

The formation of copper(II) chloride during the reaction causes the blue-green color.

During the reaction, the solution undergoes a change in color, turning blue-green. This transformation occurs due to the formation of copper(II) chloride, which imparts the distinctive blue-green hue to the solution.