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प्रश्न
What will happen if heating is not controlled while preparing plaster of Paris?
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उत्तर
If gypsum (or calcium sulphate dihydrate) is heated above 100°C (373 K) while preparing plaster of Paris, then all its water of crystallisation is eliminated and anhydrous calcium sulphate (CaSO4), called dead burnt plaster, is formed. The anhydrous calcium sulphate does not set like plaster of Paris on the addition of water.
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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.
Name a calcium compound which hardens on wetting with water.
State a peculiar (or remarkable) property of plaster of Paris.
What is gypsum?
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 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
______ is an important material in the construction industry.
Match the Following:
| 1. | Antiseptic | a. | Plaster of paris |
| 2. | Making casts for statues | b. | Phenol |
| 3. | Ease stress and relaxes | c. | Gypsum |
| 4. | Fertilizers | d. | Epsum |
Analogy:
Blackboard chalks: ______:: Plant growth: Epsum.
Analogy:
______: Calcium Sulphate Dihydrate:: Plaster of Paris: Calcium Sulphate Hemihvdrate.
