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Final answer:To rank the indicated protons in decreasing order of acidity, consider electronegativity and charge.Explanation:To rank the indicated protons in decreasing order of acidity, we need to consider a few factors:The more electronegative the atom to which the proton is bonded, the more acidic the proton is.A proton on a positively charged species is more acidic than on the same species in a neutral state.Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing electronegativity of the nonmetal atom.Using this information, we can rank the protons from most to least acidic: 5c > H₂O > NH₃....