Large amount of heat is released when potassium reacts with water.

The correct option is A True

• Metals like potassium, sodium, and calcium react vigorously with cold water to form their respective hydroxides and release hydrogen gas
• . A large amount of heat is also released. Reactions in which heat is released are called exothermic reactions.
• Potassium reacts with cold water to form Potassium hydroxide and hydrogen gas.

$\underset{\mathrm{Potassium}}{2\mathrm{K}\left(\mathrm{s}\right)}+\underset{\mathrm{Water}}{2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}\to \underset{\mathrm{Hydroxide}}{\underset{\mathrm{Potassium}}{2\mathrm{KOH}\left(\mathrm{aq}\right)}}+\underset{\mathrm{Hydrogen}}{{\mathrm{H}}_2\left(\mathrm{g}\right)}$

Thus, the given statement is true