A) whitewash
B) toothpaste
C) black board chalk
D) surgery and dentistry
Correct Answer: D
Solution :
Gypsum on heating loses a part of its water of crystallisation to form plaster of Paris. \[\underset{gypsum}{\mathop{2CaS{{O}_{4}}.2{{H}_{2}}O}}\,\xrightarrow[{}]{120{}^\circ C}\underset{laster\text{ }of\text{ }Paris}{\mathop{{{(CaS{{O}_{4}})}_{2}}{{H}_{2}}O}}\,+3{{H}_{2}}O\] Plaster of Paris an mixing with water form gypsum and sets to hard mass with little expansion. Therefore, it is used in surgery and dentistry.You need to login to perform this action.
You will be redirected in
3 sec