Final answer:In the given options, the Hydroselenide ion (HSe-) is thestrongest basedue to selenium's large size and lower electronegativity, which make it a better proton acceptor.Explanation:The strength of a base in a chemical context is determined by itsability to accept protons, with the strongest bases being those that most readily accept protons. In the given options, the compounds listed are all anions.To determine which is the strongest base, we need to consider basicity in relation to the species' size and electronegativity. Larger ions with lower electronegativity are generally betterproton acceptors, therefore stronger bases.Comparing the given ions:Cl-(Chloride),HS-(Hydrosulfide),Br-(Bromide), andHSe-(Hydroselenide), Hydroselenide (HSe-) would be the strongest base.This is because Selenium (Se) is larger and lesselectronegativethan Sulfur (S) or the halogens (Cl, Br), making its corresponding ion a better proton acceptor.Learn more about Base Strength here:brainly.com/question/32498348#SPJ11...

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