In which of these compounds does Cl have an oxidation number of +3:
A) HClO₃
B) HClO
C) HClO₂
D) Cl₂
E) HCl
IMAT 2025 · Question 34
Q34 - Oxidation number
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The correct answer is C) HClO₂.
With H = +1 and O = −2, the total has to be zero:
HClO: Cl = +1
HClO₂: Cl = +3
HClO₃: Cl = +5
Cl₂: 0
HCl: −1
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