SolutionThe correct options are
A CaO is solid.
B H2O is liquid.
D Ca(OH)2 forms a solution with water
The conventions (s), (l), (g), (aq) represents solid, liquid and solution in water.
In the equation,
CaO(s) + H2O(l) →Ca(OH)2 (aq) + Heat
∙ CaO is mentioned as (s), hence it is in solid state.
∙ H2O is mentioned as (l), hence it is in liquid state and not in vapour state.
∙ Ca(OH)2 is mentioned as (aq), hence it forms a solution with water.