UPSC CAPF AC 2026 Paper 1 · Question 110
Question 110 of the UPSC CAPF (AC) 2026 Paper I (19 July 2026). Try it first, then open the answer and explanation.
Which among the following are, respectively the correct oxidation numbers of chloride ion in Cl₂O₇, Cl₂O, ClO₃⁻ and ClO₂⁻?
- +7, +2, +4, +3
- +2, -1, -3, +4
- +7, +1, +3, -3
- +7, +1, +5, +3
Cl₂O₇, Cl₂O, ClO₃⁻ और ClO₂⁻ में, क्रमशः क्लोराइड आयन की सही ऑक्सीकरण संख्याएँ निम्नलिखित में से कौन-सी हैं?
- +7, +2, +4, +3
- +2, -1, -3, +4
- +7, +1, +3, -3
- +7, +1, +5, +3
Show answer
Answer: (4) +7, +1, +5, +3
उत्तर: (4) +7, +1, +5, +3
Take oxygen as -2 and chlorine as x: Cl₂O₇: 2x - 14 = 0, x = +7; Cl₂O: 2x - 2 = 0, x = +1; ClO₃⁻: x - 6 = -1, x = +5; ClO₂⁻: x - 4 = -1, x = +3. (The question means the oxidation number of chlorine in each species.)