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.
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