JEE Advanced Chemistry question
Consider the following reactions in which atoms have been labelled with isotopes (indicated by *) (I) S*SO3²⁻ + 2H⁺ → H2SO4 + S (II) Na2HgI2I2* + 2AgNO3 → 2AgI + HgI2 + 2NaNO3 In which case isotopes are equivalent in the products?
Answer: (B)
Solution
In the thiosulphate ion, S2O3²⁻, the two sulphur atoms occupy genuinely different structural positions — one is the central, oxidised "sulphate-like" sulphur, while the labelled S* is the terminal, loosely attached sulphur. On acidification the molecule cleanly falls apart at this structural division, so the isotope
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