Question

The chemical reaction between quicklime and water is characterised by ______.

Options

• evolution of hydrogen gas.

• formation of slaked lime precipitate.

• change in temperature of mixture.

• change in colour of the product.

Answer 1

The chemical reaction between quicklime and water is characterised by change in temperature of mixture.

Explanation:

When quicklime (calcium oxide, CaO) reacts vigorously with water (H₂O), it forms slaked lime, calcium hydroxide (Ca(OH)₂). This combination process is highly exothermic, meaning it releases a large amount of heat. As a result, the temperature of the reaction mixture rises sharply, often making the water boil and producing a distinct hissing sound.