Kemija - 2012./13. jesen - 31.

A. ${\mathrm{O}\mathrm{H}}^{-}\backslash mathrm\{OH\}^\{-\}$

B. ${\mathrm{A}\mathrm{l}}^{3+}\backslash mathrm\{Al\}^\{3+\}$

C. $[\mathrm{A}\mathrm{l}({\mathrm{H}}_2\mathrm{O}{)}_5\mathrm{O}\mathrm{H}{]}^{2+}[\backslash mathrm\{Al\}(\backslash mathrm\{H\}\_\{2\}\; \backslash mathrm\{O\})\_\{5\}\; \backslash mathrm\{OH\}]^\{2+\}$

D. ${\mathrm{H}}_3{\mathrm{O}}^{+}\backslash mathrm\{H\}\_\{3\}\; \backslash mathrm\{O\}^\{+\}$