Which of these is the correct formula for the perchlorate ion?

Question

BlackTom AI · Accepted Answer

Interpret the question as asking for the chemical formula of the perchlorate ion.
Option 1: ClO–. This corresponds to hypochlorite, where chlorine is bonded to a single oxygen with a −1 charge overall; it is not the perchlorate ion.
Option 2: ClO2–. This is chlorite, containing two oxygens around chlorine and a −1 charge; it is not the fully oxygenated perchlorate species.
Option 3: ClO3–. This represents chlorate, with three oxygens and a −1 charge; still not the perchlorate configuration.
Option 4: ClO4–. This is the perchlorate ion, featuring four oxygens coordinated with chlorine and carrying a single negative charge overall. The pattern shows successive oxidation of chlorine by adding one O atom at each stage, reaching four oxygens for perchlorate.
In summary, each predecessor (hypochlorite, chlorite, chlorate) has one, two, or three oxygens respectively, while the species with four oxygens corresponds to perchlorate.

CHEM 110 Section 3 (PM) SP25 Pre-Lecture 14 Quiz C06-4-6, C07-1-2

Which of these is the correct formula for the perchlorate ion?

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