Due to which property is plaster of Paris used for making statues and moulds?
Answer and explanation
Correct answer: Setting quickly on adding water
The relevant property is the setting reaction of plaster of Paris. When water is added to calcium sulphate hemihydrate, it changes back into gypsum, CaSO4·2H2O, and forms a hard solid mass. It can therefore be shaped in a mould before setting. Option A is correct; immediate dissolution, acid formation, and hydrogen release are not properties responsible for making statues or moulds.
Frequently asked questions
What is the correct answer to this question?
Setting quickly on adding water
Why is this the correct answer?
The relevant property is the setting reaction of plaster of Paris. When water is added to calcium sulphate hemihydrate, it changes back into gypsum, CaSO4·2H2O, and forms a hard solid mass. It can therefore be shaped in a mould before setting. Option A is correct; immediate dissolution, acid formation, and hydrogen release are not properties responsible for making statues or moulds.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
