Payal posted an Question
February 26, 2021 • 19:50 pm 30 points
  • IIT JAM
  • Chemistry (CY)

14. with increase in temperature, the gibbs free energy for the adsorption of gas on to a solid surface (a) becomes more positive from positive value (b) become

14. With increase in temperature, the Gibbs free energy for the adsorption of gas on to a solid surface (a) Becomes more positive from positive value (b) Becomes more negative from positive value (c) Becomes more positive from negative value (d) Becomes more negative from negative value

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    Priyanshu kumar Best Answer

    The equation for the change in free energy is dG = dH - TdS. Where H is the enthalpy, S is the entropy and T is the Kelvin temperature. Since the change in G depends on minus T times the change in S, if the entropy decreases (that means dS is negative) then -TdS is positive. Hence, when the temperature increases the numeric value of the free energy becomes larger. Option C is correct

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