Plaster of Paris is formed by controlled heating of gypsum. The main change is related to what?
Answer and explanation
Correct answer: Change in the amount of water of crystallisation
Gypsum is hydrated calcium sulphate, represented as CaSO4·2H2O. On controlled heating, it loses part of its water of crystallisation and forms plaster of Paris, CaSO4·½H2O. Thus option A correctly identifies the main chemical change. The process does not increase the number of metals, convert a salt into sugar, or involve the complete disappearance of an acid. Excessive heating can remove more water, so control is important.
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What is the correct answer to this question?
Change in the amount of water of crystallisation
Why is this the correct answer?
Gypsum is hydrated calcium sulphate, represented as CaSO4·2H2O. On controlled heating, it loses part of its water of crystallisation and forms plaster of Paris, CaSO4·½H2O. Thus option A correctly identifies the main chemical change. The process does not increase the number of metals, convert a salt into sugar, or involve the complete disappearance of an acid. Excessive heating can remove more water, so control is important.
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.
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