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प्रश्न
Plaster of Paris is prepared by heating one of the following to a temperature of 100°C. This is:
विकल्प
CaSO3.2H2O
CaCl2.2H2O
CaCO3.2H2O
CaSO4.2H2O
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उत्तर
CaSO4.2H2O
Explanation:
Plaster of Paris (POP) is prepared by carefully heating gypsum, which is chemically known as calcium sulphate dihydrate (CaSO4.2H2O), to exactly 100°C (373 K). At this temperature, gypsum loses three-fourths of its water of crystallisation, forming calcium sulphate hemihydrate, which is POP. If heated above 100°C, it loses all its water, becoming “dead burnt plaster” (anhydrous calcium sulphate) and losing its setting properties.
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संबंधित प्रश्न
What is the commercial name of calcium sulphate hemihydrate?
Name a calcium compound which hardens on wetting with water.
Name the compound which is used in hospitals for setting fractured bones.
Name the raw material used for the preparation of plaster of Paris.
What is plaster of Paris?
How is plaster of Paris prepared? Write a chemical equation of the reaction involved.
State two important uses of plaster of Paris.
A compound X which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water.
Write the chemical equation for its preparation
A compound X which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water.
For what purpose is it used in hospitals?
A white chemical compound becomes hard on mixing with proper quantity of water. It is also used in surgery to maintain joints in a fixed position. Name the chemical compound.
How many molecules of water of crystallisation (per formula unit) are present in:
Gypsum
At what temperature is gypsum heated to form Plaster of Paris?
How many water molecules does hydrated calcium sulphate contain?
______ is an important material in the construction industry.
______ is used in making blackboard chalks.
Analogy:
Blackboard chalks: ______:: Plant growth: Epsum.
A compound which is prepared from gypsum has the property of hardening when mixed with water. identify the compound and write its formula. How is this compound prepared? Describe it in the form of a chemical equation only.
