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Plaster of Paris hardens by...

Plaster of Paris hardens by

A

giving off `CO_(2)`

B

utilizing water

C

changing into `CaCO_(3)`

D

giving out water

Text Solution

Verified by Experts

The correct Answer is:
B
`2CaSO_(4).H_(2)O overset("Setting")underset(H_(2)O)rarrCaSO_(4).2H_(2)Ooverset("Harding")rarrCaSO_(4).2H_(2)O`
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Statement I : On mixing with water, Plaster of Paris hardens. Statement II : By combining with water, Plaster of Paris is converted into Gypsum.

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Knowledge Check

  • Plaster of Paris hardens when applied over a bandage. This process is

    A
    reversible
    B
    irreversible
    C
    physical
    D
    natural

  • Plaster of Paris is harden by

    A
    giving off `CO_2`
    B
    changing into `CaCO_3`
    C
    uniting with water
    D
    giving out water

  • Plaster of Paris is

    A
    `Ca SO _(4) . 2 H _(2) O`
    B
    `Ca SO _(4) . (1)/(2) H _(2)O`
    C
    `CaSO _(4) . 5 H _(2) O`
    D
    `CaSO _(4) . H _(2) O`
    • A2Z-S BLOCK ELEMENTS ( GROUP 13 - 14)-Section D - Chapter End Test
    1. Plaster of Paris hardens by

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    2. The mixture of MgCl(2) and MgO is called .

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    3. Which monoxide of alkali metals is slowly hydrolysed ?

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    4. Which of the following has lowest thermal stability ?

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    5. Solution of K(2)O in water in basic, because it contains a significant...

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    6. The order of melting point of chloirdes of alkali metals is :

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    7. Sodium carbonate reacts with SO(2) in aqueous medium to give

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    8. Sodium dichormate on heating with coke yields :

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    9. Which one out of the NaOH and KOH is a better absorber of CO(2) ?

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    10. Reduction of sodium nitrite by sodium metal yields:

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    11. Which of the following statement is incorrect ?

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    12. What products are formed during the electrolysis of a of a concentrat...

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    13. Na+Al(2)O(3) overset("High temp.") rarrXoverset(CO(2)" in")underset("w...

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    14. What happens when a mixture of sodium sulphate, lime stone and coke is...

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    15. The order of basicity of hydroxides of alkali metals is

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    16. What happens when sodium metal is heated to a temperature 350^(@)C in ...

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    17. Solubility of an ionic compound in water is mainly dependent on: a...

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    18. Na(2)Be(OH)(4)] is formed when

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    19. What is the formula of basic anhydride of Ba(OH)(2)?

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    20. What is the correct order of thermal stability of carbonates of alkali...

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