Question

(A) Give reason: Plastic of Paris should be stared in a moisture proof container
(B) Explain the formation of scum when hard water is treated with soap. ​

Answer 1

Explanation:

Plaster of Paris (POP) should be stored in a moisture-proof container because Plaster of Paris, a powdery mass, absorbs water (moisture) to form a hard solid known as gypsum.