Question

Cao is taken in a container and water is added slowly to it. state 2 observation and mention the type of reaction.

Answer 1

CaO+H2O=>Ca(OH)2

OBSERVATIONS :
1)The container becomes hot because of the evolution of heat.
2)The lime water is prepared.

TYPE OF REACTION :
•Combination reaction
•Exothermic reaction

Answer 2

When CaO is taken in a container, it results in the formation of lime water i.e. Ca ( OH ) ^ 2 as Cao + H2O become the reactants. The observation is that heat is evoluted and it may even turn milky when CO2 is passed through it.
Hope it helped..