**(A):** is a non-stoichiometric compound. <br> **(R):** It contains and in a specific ratio to main — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

**Assertion:** The metal-to-oxygen ratio is not a simple whole number, which is the definition of a non-stoichiometric compound. Statement is true. <br>**Reason:** In the crystal lattice, some $Fe^{2+}$ ions are missing. To maintain electrical neutrality, two $Fe^{3+}$ ions are present for every missing $Fe^{2+}$. This creates the observed non-stoichiometry.