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NEET Sample Paper NEET Sample Test Paper-42

  • question_answer
    For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb caloriemeter, Au and w correspond to:

    A) \[\Delta u < 0, w = 0\]

    B)               \[\Delta u < 0, w < 0\]

    C) \[\Delta u > 0, w = 0\]               

    D) \[\Delta u > 0, w > 0\]

    Correct Answer: A

    Solution :

    As the reaction is carried out in a closed versel (bomb calorie meter), no expansion or contraction can take place, \[\therefore  Work done, w=0\] Hence by 1st law of thermodynamics, \[\Delta U=q\] But q is -ve, i.e. < 0 As the reaction is exothermic \[\therefore \Delta U<0\]


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