Kemija - 2020. jesen, 30.

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

B. ${\mathrm{H}}_2\mathrm{O}\backslash mathrm\{H\}\_\{2\}\; \backslash mathrm\{O\}$

C. ${\mathrm{P}\mathrm{O}}_4{}^{3-}\backslash mathrm\{PO\}\_\{4\}\{\; \}^\{3-\}$

D. ${\mathrm{H}}_2{\mathrm{P}\mathrm{O}}_4^{-}\backslash mathrm\{H\}\_\{2\}\; \backslash mathrm\{PO\}\_\{4\}^\{-\}$