Question

A reaction attains equilibrium state under standard conditions, then

• A. equilibrium constant $K=0$.
• B. equilibrium constant $K=1$
• C. $\Delta G^{\ominus }=0$ and $\Delta H^{\ominus }=T\Delta S^{\ominus }$
• D. $\Delta G=0$ and $\Delta H=T\Delta S$

Answer 1

Answer: (B), (C), (D)

The correct options are
B equilibrium constant $K=1$
C $\Delta G^{\ominus }=0$ and $\Delta H^{\ominus }=T\Delta S^{\ominus }$
D $\Delta G=0$ and $\Delta H=T\Delta S$

$(b,c,d)$ $\Delta G^{\ominus }=0$ at equilibrium under standard state. Also at equilibrium $\Delta G=0$
$\therefore$ $\Delta H^{\ominus }-T\Delta S^{\ominus }=0$
Also $\Delta G^{\ominus }=2.303RTlnK$
$\therefore$ $K=1$