MCQ
The standard reaction Gibbs energy for a chemical reaction at an absolute temperature $T$ is given by

${\Delta _r}{G^o} = A - BT$

Where $A$ and $B$ are non -zero constant. Which of the following is $TRUE$ about this reaction?

  • Endothermic if $A > 0$
  • B
    Exothermic if $A > 0$ and $B < 0$
  • C
    Endothermic if $A < 0$ and $B > 0$
  • D
    Exothermic if $B < 0$

Answer

Correct option: A.
Endothermic if $A > 0$
a
$\Delta {G^o} = \Delta {H^o} - T\Delta {S^o}$

$\Delta {G^o} = A - BT$

In endothermic reaction  $\Delta H =  + ve$. Hence, $A = +ve$

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