Question

the constituent element present in hard solid mass formed on mixing water with plaster of paris

Answer 1

CaSO4.2H2O ( Gypsum ) is the constituent element present in it.

Answer 2

Plaster of Paris: A mixture of sand and cement that is used for spreading on ceilings or other structures which results in a smooth hard surface when dried is referred to as plaster of paris.

Action with water: Plaster of paris sets into a hard mass when water is added into it. This process takes half an hour to settle.

Reason: They form crystals of gypsum due to hydration which set to form hard and solid mass.

Hence, The constituent elements present in hard solid mass  formed on mixing water with Plaster of Paris is gypsum.

Read more on Brainly.in - https://brainly.in/question/6404702