Kemija - 2012./13. jesen - 35.

A. ${\mathrm{S}}_2{\mathrm{O}}_5{}^{2-}\backslash mathrm\{S\}\_\{2\}\; \backslash mathrm\{O\}\_\{5\}\{\}^\{2-\}$

B. $\mathrm{SO}_{4}{ }^{2-}$

C. $\mathrm{SO}_{3}{ }^{2-}$

D. ${\mathrm{S}}_2{\mathrm{O}}_3{}^{2-}\backslash mathrm\{S\}\_\{2\}\; \backslash mathrm\{O\}\_\{3\}\{\; \}^\{2-\}$