JEE Advanced 2010 Chemistry question
Among the following, the number of elements showing only one non-zero oxidation state is O, Cl, F, N, P, Sn, Tl, Na, Ti
Answer: 2
Solution
Check the oxidation states each element shows in its compounds. O: −2 (oxides), −1 (peroxides), −1/2 (superoxides), +1 (), +2 () — several. Cl: −1, +1, +3, +4, +5, +6, +7 — several. F: being the most electronegative element, it shows only −1 in
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