19. Select the correct name for the coordination compound with the formula: K_3[Fe(C_2O_4)_3]. (A) Potassium trioxalate ferrate(III) (B) Potassium tris(oxalato)iron(III) (C) Potassium tris(oxalato)ferrate(III) (D) Potassium trioxalate iron(III) (E) Tripotassium tris(oxalato)ferrate(III)

19. Select the correct name for the coordination compound with the formula: $\mathsf{K}_3[\mathsf{Fe}(\mathsf{C}_2\mathsf{O}_4)_3]$.
(A) Potassium trioxalate ferrate(III)
(B) Potassium tris(oxalato)iron(III)
(C) Potassium tris(oxalato)ferrate(III)
(D) Potassium trioxalate iron(III)
(E) Tripotassium tris(oxalato)ferrate(III)

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統計： A(1), B(0), C(0), D(0), E(0) #3922363

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B1 · 2026/10/12

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22. Cerium(IV) ion is a strong oxidizing agent that accepts one electron to produce cerium(III) ion. A solution containing an unknown concentration of $Sn^{2+}$ ions was titrated with a solution containing $Ce^{4+}$ ions, which oxidize the $Sn^{2+}$ ions to $Sn^{4+}$ ions. In one titration $1.00\ \mathrm{L}$ of the unknown solution required $46.45\ \mathrm{mL}$ of a $0.1050\ \mathrm{M}\ Ce^{4+}$ solution to reach the stoichiometric point. $$ a\ Ce^{4+}(aq) + b\ Sn^{2+}(aq) \longrightarrow c\ Ce^{3+}(aq) + d\ Sn^{4+}(aq) $$ What is the closest concentration of $Sn^{2+}$ ions in the unknown solution? (A) $2.4 \times 10^{-3}$ (B) $2.4 \times 10^{-2}$ (C) $2.7 \times 10^{-3}$ (D) $2.7 \times 10^{-2}$ (E) $3.0 \times 10^{-3}$

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