Plaster of Paris is obtained when gypsum is heated to
A. 293 K
B. 493 K
C. 593 K
D. 393 K
A. 293 K
B. 493 K
C. 593 K
D. 393 K
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Correct Answer – 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.