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Ionic compounds and formula units Original Scenario-Based Practice

Chemistry · Chemical Bonding & Molecular Structure · Chemistry · Ionic Bonding

1 Chemistry practice questions on Ionic compounds and formula units. Questions built around original scenarios.

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  1. 1.

    An autonomous deep-space probe discovers an inorganic crystalline deposit whose continuous three-dimensional lattice is constructed purely of chromium(III) cations (Cr3+\mathrm{Cr}^{3+}) and oxide anions (O2−\mathrm{O}^{2-}). The probe's automated analyzer registers no discrete molecular boundaries anywhere throughout the macroscopic crystal specimen. Based on the fundamental nature of ionic compounds, which statement correctly defines the chemical entity represented by the empirical formula Cr2O3\mathrm{Cr}_2\mathrm{O}_3?

    • A) It represents a discrete, isolated molecule of chromium(III) oxide that migrates independently throughout the crystal structure.
    • B) It indicates that each individual chromium ion forms localized, directional covalent bonds with exactly one and a half oxygen atoms.
    • C) It represents a formula unit, designating the lowest whole-number ratio of ions that maintains electrical neutrality across the continuous crystal lattice.
    • D) It specifies the exact, total count of chromium and oxygen ions present within the entire bulk mineral specimen.

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