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प्रश्न
Plaster of Paris is prepared by heating one of the following to a temperature of 100°C. This is:
पर्याय
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
Name the product obtained when Plaster of Paris is mixed with water. State the use of the product. Give two uses of POP.
Write an equation to show the reaction between plaster of Paris and water.
The chemical formula of plaster of Paris is ______.
What will happen if heating is not controlled while preparing plaster of Paris?
Name the raw material used for the preparation of plaster of Paris.
Which property of plaster of Paris is utilised in making casts for broken limbs in hospitals?
A compound X which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water.
- Identify the compound X.
- Write the chemical equation for its preparation.
- For what purpose is it used in hospitals?
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
The chemical formula for plaster of Paris is:
At what temperature is gypsum heated to form Plaster of Paris?
______ is used in making blackboard chalks.
Calcium sulphate hemihydrate is called as ______.
Analogy:
Blackboard chalks: ______:: Plant growth: Epsum.
