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Q110
(CAPF/2026)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
Which among the following are, respectively the correct oxidation numbers of chloride ion in Cl2O7, Cl2O, ClO3 and ClO2?
Result
Your answer:
—
·
Correct:
D
Explanation
The oxidation number of an element in a compound is determined by the rule that the sum of oxidation states equals the net charge of the species. Oxygen typically has an oxidation state of -2.
- Cl2O7: 2(x) + 7(-2) = 0 → 2x = 14 → x = +7.
- Cl2O: 2(x) + 1(-2) = 0 → 2x = 2 → x = +1.
- ClO3- (Chlorate ion): x + 3(-2) = -1 → x - 6 = -1 → x = +5.
- ClO2- (Chlorite ion): x + 2(-2) = -1 → x - 4 = -1 → x = +3.
The sequence +7, +1, +5, and +3 matches Option D. Although the question text refers to "chloride ion" (a term usually reserved for Cl-) and omits the charges for the oxyanions, the calculated values for these specific chlorine oxides and ions align perfectly with the provided options.
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