JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank First law of thermodynamics and Hess law

  • question_answer
    For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, \[\Delta \text{U}\] and w correspond to      [AIIMS 2005]

    A)                 \[\Delta \text{U}<0,\ w=0\]       

    B)                 \[\Delta \text{U}=0,\ w<0\]

    C)                 \[\Delta \text{U}>0,\ w=0\]       

    D)                 \[\Delta \text{U}<0,\ w>0\]

    Correct Answer: A

    Solution :

               Bomb calorimeter is commonly used to find the heat of combustion of organic substances which consists of a sealed combustion chamber, called a bomb. If a process is run in a sealed container then no expansion or compression is allowed, so w = 0 and ∆U = q.                                 ∆U < 0, w = 0


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