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NEST2014ChemistryGeneral Principles and Processes of Isolation of Metals

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 Fe ²⁺ completely and finally titrating it with aqueous acidic KMnO ₄ . The

Options

  1. AThe mass of iron formed is 1.76 g .
  2. BThe number of electrons involved in the redox reaction during titration is 5.
  3. CThe paramagnetism of the solution decreases during the reaction of Fe ²⁺ with KMnO ₄ .
  4. DDuring the titration, manganese containing species changes its geometry from square planar to tetrahedral.

Correct answer

B. The number of electrons involved in the redox reaction during titration is 5.

Step-by-step solution

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