JEE PYQ: Thermodynamics Question 38
Question 38 - 2019 (11 Jan Shift 2)
The standard reaction Gibbs energy for a chemical reaction at an absolute temperature T is given by $\Delta G^\circ = A - BT$ where A and B are non-zero constants. Which of the following is true about this reaction?
(1) Exothermic if $B < 0$
(2) Endothermic if $A > 0$
(3) Endothermic if $A < 0$ and $B > 0$
(4) Exothermic if $A > 0$ and $B < 0$
Show Answer
Answer: (2)
Solution
$\Delta G^\circ = A - BT$. A and B are non-zero constants. $\Delta G^\circ = \Delta H^\circ - T\Delta S^\circ = A - BT$. Reaction will be endothermic if $\Delta G^\circ > 0$. Hence, $A > 0$ and $B < 0$.
BETA
