The following reactions all occur in a blast furnace. Which of these are redox reactions?(a) 3Fe2O3(s) + CO(g) ⟶ 2Fe3O4(s) + CO2(g)(b) Fe3O4(s) + CO(g) ⟶ 3FeO(s) + CO2(g)(c) FeO(s) + CO(g) ⟶ Fe(l) + CO2(g)(d) C(s) + O2(g) ⟶ CO2(g)(e) C(s) + CO2(g) ⟶ 2CO(g)(f) CaCO3(s) ⟶ CaO(s) + CO2(g)(g) CaO(s) + SiO2(s) ⟶ CaSiO3(l)

4. Consider the following reaction: [ZnCl4]² +4 OH → [Zn(OH)4]² +4 CI If the reaction is spontaneous, then which of the following is true? (A) Chloride is a more labile ligand than hydroxide in zinc complexes (B) Hydroxide is a more labile ligand than chloride in zinc complexes (C) Chloride is a more inert ligand than hydroxide in zinc complexes (D) Hydroxide and chloride are equally labile in zinc complexes

(a) Give the chemical name of Ir(CO)CI(PPh 3 ) 2 (either of the two isomers). (b) Sketch all isomers of the octahedral complex Cr(H2O), FBrCl (hint: there are five, and two of the five are enantiomers of each other).

A coordination compound has the following composition (by mass %): 23.53% Co; 42.47% Cl, and 34.00% NH3. When 4.91 g of the compound is dissolved in 75.0 mL of deionized water, and the solution is reacted with an excess of AGNO; solution, it yields 5.60 g of AgCl precipitate. (a) Determine the empirical formula of the compound and write in the form of Co(NH;),Cl, (where x and 24. y are simple integers), and calculate its molar mass. (Assume the compound contains only one Co atom). (b) Deduce the number of chloride (Cl) as counter ions and as ligand, respectively. (c) Write the Werner's formula of the compound and give its systematic name. (Answers: (a) Co(NH3);C13; molar mass = 250.43 g/mol; (b) 2 Cl are counter ions and one is ligand; (c) [Co(NH3);CI]Cl2 = pentaammonechlorocobalt(III) chloride)