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Calcium Carbonate and Calcium Sulphate(Plaster of Paris) - Practice Questions & MCQ
Edited By admin | Updated on Sep 18, 2023 18:35 AM | #JEE Main
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70 Questions around this concept.
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In curing cement plasters water is sprinkled from time to time. This helps in:
Which one of the following alkaline earth metal sulfates has its hydration enthalpy greater than its lattice enthalpy?
The substance not likely to contain is
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Solubility of the alkaline earth's metal sulphates in water decreases in the sequence:
The alkaline earth metal sulphate(s) which are readily soluble in water is/are :
Choose the correct answer from the options given below :
Match List I with List II
Choose the correct answer from the options given below:
Given below are two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R).
Assertion (A): Gypsum is used for making fireproof wall boards.
Reason (R): Gypsum is unstable at high temperatures.
In the light of the above statements, choose the correct answer from the options given below :
The setting time of Cement is increased by adding
What is the purpose of adding gypsum to cement?
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Calcium Carbonate - CaCO3 and Calcium Sulphate(Plaster of Paris) - CaSO4·1⁄2H2O
Calcium Carbonate, CaCO3
In nature, it occurs as limestone, ice land spar, marble and shells of sea animals.
Preparation
In the laboratory it is prepared by passing CO2 through lime water or by adding sodium carbonate solution into calcium chloride as follows:
Uses
- It is used in the preparation of cement, washing soda (NaHCO3 by Solvay method).
- In the extraction of many metals like iron.
- Marble is used as a building material.
- Precipitated chalk is used in the manufacture of paints, medicines and toothpaste etc.
Calcium Sulphate (Plaster of Paris), CaSO4·1⁄2 H2O
It is known as calcium sulphate hemihydrate
Preparation
It is obtained when gypsum, , is heated to 393 K.
Above 393 K, no water of crystallisation is left and anhydrous calcium sulphate, CaSO4 is formed. This is known as ‘dead burnt plaster’. It has a remarkable property of setting with water. On mixing with an adequate quantity of water it forms a plastic mass that gets into a hard solid in 5 to 15 minutes.
Uses
- Plaster of Paris is used for plaster of broken bones, making statues, toys, chalks etc.
- It is also used as a building material.
- It is used for making moulds for casting.
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