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Question

Plaster of Paris hardens by


A

Giving off CO2

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B

Changing into CaCO3

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C

Giving out water

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D

Utilizing water

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Solution

The correct option is D

Utilizing water


Explanation of correct option.

Option (D) Utilizing water

  • Plaster of Paris is a salt of calcium metal which is also called calcium sulfate hemihydrate.
  • The chemical formula of Plaster of Paris is CaSO4·12H2O.
  • It is formed by the intense heating of gypsum which is also a salt of calcium.
  • When we add water to the Plaster of Paris it becomes soft and forms a paste. This paste becomes hardened after some time because of the formation of strong hydrogen bonding between molecules of Plaster of Paris and water.

Explanation of incorrect options:

Option (A) Giving off CO2

  • The equation can be written as,

CaSO4·12H2OPlasterofparis+32H2OWaterCaSO4·2H2O(Hard)Gypsm

  • The reaction does not give out CO2.
  • Hence, incorrect option.

Option (B) Changing into CO3

  • The equation can be written as,

CaSO4·12H2OPlasterofparis+32H2OWaterCaSO4·2H2O(Hard)Gypsm

  • This reaction does not give CO3.
  • Hence, incorrect option.

Option (C) Giving out water.

  • Since water is utilized in the process of hardening of Plaster of Paris, no water is given out.
  • Hence, incorrect option.

Therefore, option (D) is the correct answer.


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