Final answer:The compounds ranked from strongest to weakest base are NH₃, HPO₄²⁻, SO₄²⁻, and NO₂, based on their ability to accept protons.Explanation:To rank the compounds in order of decreasing base strength, we must consider their ability to attract and hold onto protons (H+ ions). A stronger base will more readily accept a proton.NH₃ (ammonia) is a common weak base.HPO₄²⁻ (hydrogen phosphate) is the conjugate base of a weak acid (H₂PO₄⁻) and can act as a base.SO₄²⁻ (sulfate) is a very weak base because it's the conjugate base of a strong acid (H₂SO₄).NO2 (nitrite) is a very weak base, weaker than sulfate, as evidenced by its position in the given base strength order and its relative non-tendency to accept protons.Therefore, in decreasing order of base strength: NH₃ > HPO₄²⁻ > SO₄²⁻ > NO₂....

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