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28. Magnetite is an iron oxide ore, which reacts with carbon monoxide to give iron metal and carbon dioxide. When a sample of magnetite is allowed to react with sufficient carbon monoxide, 0.896 L carbon dioxide was produced at NTP. The percentage of iron in magnetite can also be determined by dissolving the ore in acid, then reducing the iron to Fe2+ completely and finally titrating it with aqueous acidic KMnO4. The atomic weights of Fe, C and O are 58.8, 12.0 and 16.0 a.m.u., respectively. The correct statement(s) is/are (A) The mass of iron formed is 1.76 g. (B) The number of electrons involved in the redox reaction during titration is 5. (C) The paramagnetism of the solution decreases during the reaction of Fe2+ with KMnO4. (D) During the titration, manganese containing species changes its geometry from square planar to tetrahedral. |
| Answer» 28. Magnetite is an iron oxide ore, which reacts with carbon monoxide to give iron metal and carbon dioxide. When a sample of magnetite is allowed to react with sufficient carbon monoxide, 0.896 L carbon dioxide was produced at NTP. The percentage of iron in magnetite can also be determined by dissolving the ore in acid, then reducing the iron to Fe2+ completely and finally titrating it with aqueous acidic KMnO4. The atomic weights of Fe, C and O are 58.8, 12.0 and 16.0 a.m.u., respectively. The correct statement(s) is/are (A) The mass of iron formed is 1.76 g. (B) The number of electrons involved in the redox reaction during titration is 5. (C) The paramagnetism of the solution decreases during the reaction of Fe2+ with KMnO4. (D) During the titration, manganese containing species changes its geometry from square planar to tetrahedral. | |