KVPY Sample Paper KVPY Stream-SX Model Paper-21

  • question_answer
    The pair that does NOT require calcination is:

    A) \[ZnO\] and \[MgO\]

    B) \[ZnO\] and \[F{{e}_{2}}{{O}_{3}}.x{{H}_{2}}O\]

    C) \[ZnC{{O}_{3}}\] and \[CaO\]

    D) \[F{{e}_{2}}{{O}_{3}}\]and \[CaC{{O}_{3}}.MgC{{O}_{3}}\]

    Correct Answer: A

    Solution :

    In calcination the ore is converted to metal oxide. \[ZnO\] and \[MgO\] are already in oxide form.

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