BCECE Medical BCECE Medical Solved Papers-2009

  • question_answer Plaster of Paris is hardened by

    A)  liberating \[C{{O}_{2}}\]

    B)  hydration

    C)  dehydration

    D)  changing into \[CaC{{O}_{3}}\]

    Correct Answer: B

    Solution :

    When water is added to plaster of Paris, a substance, called gypsum, that becomes hard, is formed. Thus, plaster of Paris is hardened by hydration. \[\underset{plaster\text{ }of\text{ }Paris}{\mathop{CaS{{O}_{4}}.\frac{1}{2}{{H}_{2}}O+1\frac{1}{2}{{H}_{2}}O}}\,\xrightarrow{{}}\underset{\begin{smallmatrix}  gypsum \\  (hard) \end{smallmatrix}}{\mathop{CaS{{O}_{4}}\,\,.\,\,2{{H}_{2}}O}}\,\]

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