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 $\mathrm{Fe}^{2+}$ completely and finally titrating it with aqueous acidic $\mathrm{KMnO}_4$. The atomic weights of $\mathrm{Fe}, \mathrm{C}$ and O are 58.8, 12.0 and 16.0 a.m.u., respectively. The correct statement(s) is/are

• Correct answer
  A

  The mass of iron formed is 1.76 g .
• Correct answer
  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 $\mathrm{Fe}^{2+}$ with $\mathrm{KMnO}_4$.
• D

  During the titration, manganese containing species changes its geometry from square planar to tetrahedral.

Hence, the correct answer is options: 'A', 'B'.