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According to Arrhenius, a base in aqueous solution is a substance that liberates
Ahydroxide ions (OH⁻)
Bhydrogen ions (H⁺)
Coxide ions (O²⁻)
Delectrons (e⁻)
Answer & Solution
Correct answer: A. hydroxide ions (OH⁻)
1. Arrhenius defined an acid as a substance giving H⁺ ions in water.
2. A base, conversely, gives OH⁻ ions in water.
3. NaOH, KOH and Ca(OH)₂ are Arrhenius bases.
_Source: Maharashtra Balbharati Std XII Chemistry, Ch 3 "Ionic Equilibria" §3.2_
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