Question

A large quantity of heat is absorbed when a small quantity of water is added to quick lime.

• A. True
• B. False

Answer 1

The correct option is B False

• The molecular formula of Quicklime $\left(\mathrm{CaO}\right)$.
• When water is added to quicklime, a lime suspension is formed as shown -
• $\underset{\mathrm{Quicklime}}{\mathrm{CaO}\left(\mathrm{s}\right)}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}\to \underset{\mathrm{Slakedlime}}{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2\left(\mathrm{s}\right)}+\mathrm{Heat}$
• From the above reaction, it is clear that quicklime on reaction with water forms slaked lime which is used in whitewashing, along with this a large amount of heat is evolved.

Hence, the given statement is False.

The correct statement - A large quantity of heat is evolved when a small quantity of water is added to quick lime.