If $\Delta_r \mathrm{H}^{\ominus}$ and $\Delta_r \mathrm{~S}^{\ominus}$ are standard enthalpy change and standard entropy change respectively for a reaction, the incorrect option is

• A

  $\Delta_r \mathrm{H}^{\ominus}=$ negative; $\Delta_r \mathrm{~S}^{\ominus}=$ positive; spontaneous at all temperatures
• Correct answer
  B

  $\Delta_r \mathrm{H}^{\ominus}=$ negative; $\Delta_r \mathrm{~S}^{\ominus}=$ negative; non-spontaneous at low temperatures
• C

  $\Delta_r \mathrm{H}^{\ominus}=$ positive; $\Delta_r \mathrm{~S}^{\ominus}=$ positive; non-spontaneous at low temperatures
• D

  $\Delta_r \mathrm{H}^{\ominus}=$ negative; $\Delta_r \mathrm{~S}^{\ominus}=$ negative; spontaneous at low temperatures

Hence, the correct answer is option: 'B'.