Difficult
In which of the following reactions is no gas evolved on the product side? (Temperature is maintained below the boiling point of liquids formed)
- A$H_3PO_3 \xrightarrow{\Delta }$
- B$PbO_{2(s)} \xrightarrow{\Delta }$
- C$BaS_{(s)} + ZnSO_4(aq.) \to $
- D$S + \text{conc. } H_2SO_4 \to $
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