BHU PMT BHU PMT (Mains) Solved Paper-2011

  • question_answer

    Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:

    The enthalpy change for the process\[C(graphite)\xrightarrow{{}}C(g)\]is called (1) heat of vaporisation (2) heat of sublimation (3) heat of atomization (4) heat of allotropic change

    A)  1, 2 and 3 are correct

    B)  1 and 2 are correct

    C)  2 and 4 are correct

    D)  1 and 3 are correct

    Correct Answer: C

    Solution :

                     In the process,\[{{C}_{(graphite)}}\xrightarrow[{}]{{}}C(g)\] Sublimation as well as conversion of crystalline allotropic form (graphite) to amorphous form (gas carbon) takes place.


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