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In which pair of ions both the species contain S–S bond?

1. S4O6²⁻, S2O3²⁻
2. S2O7²⁻, S2O6²⁻
3. S4O6²⁻, S2O7²⁻
4. S2O7²⁻, S2O3²⁻

Correct answer: S4O6²⁻, S2O3²⁻

Solution

The ion S4O6²⁻ (tetrathionate) contains two S–S bonds, and S2O3²⁻ (thiosulfate) contains one S–S bond. Thus, both species have S–S bonds.

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