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Anjali posted an Question
January 05, 2021 • 01:46 am 30 points
  • IIT JAM
  • Chemistry (CY)

When a gas is subjected to adiabatic expansion, its gets cooled due to a) fall in temperature (b) loss in kinetic energy () decrease in velocity ( energy spent

When a gas is subjected to adiabatic expansion, its gets cooled due to a) fall in temperature (b) loss in kinetic energy () decrease in velocity ( energy spent in doing work

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    Priyanshu kumar Best Answer

    check this explanation

    cropped7647936587247402105.jpg
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    Option A and D both are correct

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    https://doubtnut.com/question-answer-chemistry/when-a-gas-is-subjected-to-adiabatic-expansion-it-gets-cooled-due-to--12003704 check this video explanation

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    sir mathematical expression for first law of thermodynamic is U=q+w.... not U=q-w

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    anjali both mathematical expressions is correct just condition changes

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    can u pls explain more about this answer

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    ok wait

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    dU=dQ-dW hota hai...or jb hm work of compression ki baat karte hai to dw=pdv hota hai or jb hm work of expansion ki baat krte hai to dw=-pdv hota hai...so du=dq+pdv ho jata hai expansion case me

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    yha work done positive hai so dU=dq-dw hi rha hai

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    sir m ye puch rhi hu iska ans A and D kyu h

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    fall in temperature hua ...this you got na?

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    after that kyunki work done by the system ho rha hai in falling the temp...so energy is spent in doing work

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    ok thnku sir

  • comment-profile-img>
    Dinesh khalmaniya 1 best-answer

    option B explanation- According to II law of thermodynamics: q=ΔU+(−w) For isothermal expansion ΔU=0 ∴q=−w

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    its ans in my book is d

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    it's wrong given

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    sir can u pls explain ans.....

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