The compound C11Co4N11\text{C}_{11}\text{Co}_4\text{N}_{11}C11Co4N11 is a mixed-valence cobalt complex containing Co2+\text{Co}^{2+}Co2+, Co3+\text{Co}^{3+}Co3+, and CN−\text{CN}^-CN− ions.
What are the numbers of Co2+\text{Co}^{2+}Co2+ and Co3+\text{Co}^{3+}Co3+ ions in one formula unit of C11Co4N11\text{C}_{11}\text{Co}_4\text{N}_{11}C11Co4N11?
1 Co2+\text{Co}^{2+}Co2+ and 3 Co3+\text{Co}^{3+}Co3+
2 Co2+\text{Co}^{2+}Co2+ and 2 Co3+\text{Co}^{3+}Co3+
3 Co2+\text{Co}^{2+}Co2+ and 1 Co3+\text{Co}^{3+}Co3+
4 Co2+\text{Co}^{2+}Co2+ and 0 Co3+\text{Co}^{3+}Co3+
