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NEET Sample Paper NEET Sample Test Paper-88

  • question_answer
    If R is universal gas constant, the amount of heat needed to raise the temperature of 2 moles of an ideal monoatomic gas from 273 K to 373 K, when no work is done, is

    A) 100 R   

    B)        150 R

    C) 300 R

    D)        500 R

    Correct Answer: C

    Solution :

    [c] If a gas is heated at constant volume then no work is done. The heat supplied is given by \[dQ=n{{C}_{v}}dT\] But \[{{C}_{v}}=\frac{f}{2}R\] where \[f\] is the degree of freedom of the gas \[\therefore \] \[dQ=\frac{nfRdT}{2}\] \[=\frac{2\times 3\times R\times (373-273)}{2}=300\,R\]


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