[单选题]
The following graph shows tfif(3jg;rie :9 mz6chp 8ep6dhe Gibbs free energy against tqb 2ib hbuiq,e r+-:o1/eua mx3x uq,a0;b /bnhe extent of reaction for a reversible reaction -o3b ,0uhi;2/rbuxbma b :+xnaequ,b/iq qe1.
At what point is the reaction at equilibrium?
A. 1
B. 2
C. 3
D. 4
参考答案: B
本题详细解析: At equilibrium, Gibbs free energy is at a minimum.
