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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