JEE Main & Advanced Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank Mock Test - Surface Chemistry

  • question_answer
    I, II and III are three adsorption isotherm at three temperatures\[{{T}_{1}}\], \[{{T}_{2}}\]and \[{{T}_{3}}\] where x is the amount of adsorbate adsorbed on m g of the adsorbent. Temperatures \[{{T}_{1}}\], \[{{T}_{2}}\] and \[{{T}_{3}}\] are in the order

    A) \[{{T}_{1}}<{{T}_{2}}<{{T}_{3}}\]  

    B) \[{{T}_{1}}={{T}_{2}}={{T}_{3}}\]

    C) \[{{T}_{3}}<{{T}_{2}}<{{T}_{1}}\]  

    D) No specific order

    Correct Answer: A

    Solution :

    [a] Adsorption is an exopthermic change thus, as temperature increases, extent of adsorption decreases. Extent of \[\left( \frac{x}{m} \right)\] is minimum at \[{{T}_{3}}\] and is maximum at \[{{T}_{1}}\] Thus, \[{{T}_{1}}<{{T}_{2}}<{{T}_{3}}\]


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