Which one of the following reactions does not occur ?

Which one of the following reactions does not occur ?
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Which one of the following reactions does not occur ? A. `BaO+O_(3)rarrBaO_(2)+O_(2)` B. `PbS+4O_(3)rarrPbSO_ ... (2)` D. `2Hg+O_(2)rarrHg_(2)O+O_(2)`
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