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Which ion is the only negative ion present in an aqueous solution of an Arrhenius base? (1) hydride ion (3) hydronium ion (2) hydrogen ion (4) hydroxide ion
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Which ion is the only negative ion present in an aqueous solution of an Arrhenius base?

(1) hydride ion (3) hydronium ion
(2) hydrogen ion (4) hydroxide ion

User Antiduh
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The correct answer is option 4. It is the hydroxide ions that is produced by an Arrhenius base in water. According to Arrhenius, acid-base reactions are characterized by acids which forms hydronium ions in water and bases which dissociates in aqueous solution to form hydroxide ions.
User Joakim Engstrom
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