JEE Advanced Chemistry question
How many of the following have the underlined atoms in different oxidation states? K2HgI4, CaOCl2, Na2S2O3, Na2S4O6, H2SO5, H2S2O8, CrO5, I3−
Answer: 6
Solution
Checking each compound for whether its multiple underlined atoms of the same element sit at different (non-equivalent) oxidation states within the same formula: CaOCl2 (bleaching powder) has one Cl as chloride (−1) and one as hypochlorite (+1) — different. Na2S2O3 (thiosulphate) has its two sulphurs at different
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