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Plaster of Paris is obtained when gypsum...

Plaster of Paris is obtained when gypsum is heated to

A

293 K

B

493 K

C

593 K

D

393 K

Text Solution

Verified by Experts

The correct Answer is:
D
`2CaSO_(4).2H_(2)Ooverset(393K)to2CaSO_(4).(1)/(2)H_(2)O+3H_(2)O`
Above 393 K no water of crystallization is left and anhydrous calcium sulphate called head burnt plaster is formed. It is so called because it loses the properties of setting with water. Gypsum should not be allowed to come in contact with C containing fuel otherwise some of it will be reduced to calcium sulphite.
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Plaster of Paris is used

Consider the following statements : (i) Washing soda on strong heating gives sodium oxide and carbon dioxide. (ii) Plaster of Paris is obtained by heating gypsum at 373 K. (iii) Bleaching powder is used for disinfecting drinking water. Which of these statement(s) is/are correct ?

Knowledge Check

  • Plaster of Paries is obtained

    A
    by adding water to calcium sulphate
    B
    by adding sulphuric acid to calcium hydroxide
    C
    by heating gypsum to a very high temperature
    D
    by heating gypsum to `100^(@)C` .

  • Plaster of Paris is obtained by heating

    A
    gypsum
    B
    limestone
    C
    sodium carbonate
    D
    calcium sulphate

  • Plaster of paris of

    A
    `CaSO_(4)2.H_(2)O`
    B
    `CaSO_(4).3H_(2)O`
    C
    `CaSO_(4).H_(2)O`
    D
    `CaSO_(4).1/2H_(2)O`

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