JEE Main & Advanced Chemistry The s-Block Elements Question Bank Critical Thinking

  • question_answer Which of the following salt becomes plaster of paris on being appropriately hydrated [CPMT 1985]

    A) \[ZnC{{O}_{3}}\]

    B) \[CaS{{O}_{4}}\]

    C) \[MgS{{O}_{4}}\]

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

    Correct Answer: B

    Solution :

    \[\underset{\text{Gypsum}}{\mathop{CaS{{O}_{4}}.2{{H}_{2}}O}}\,\xrightarrow{{{120}^{o}}C}\underset{\text{Ploster of paris}}{\mathop{CaS{{O}_{4}}.\frac{1}{2}{{H}_{2}}O}}\,+1\frac{1}{2}{{H}_{2}}O\]


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