Question

Quick line reacts vigorously with water realising a large amount of heat

Answer 1

CaO+H2O = Ca(OH)2 + Heat
It reacts with water and forms calcium hydroxide and heat

Answer 2

it is an exothermic reaction and does the formation of calcium hydroxide take place. When Calcium oxide i.e. quick lime is added to water filled in a bucket, it reacts vigorously with water to produce slaked lime (calciumhydroxide) releasing a large amount of heat