Question

Which of the following options given below are correct?

• A. $\Delta H$ : –Ve ; $\Delta S$ : +Ve ; Nature of reaction : Spontaneous at all temperature
• B. $\Delta H$ : +Ve ; $\Delta S$ : –Ve ; Nature of reaction : Non spontaneous regardless of temperature
• C. $\Delta H$ : +Ve ; $\Delta S$ : +Ve ; Nature of reaction : Spontaneous at high temperature
• D. $\Delta H$ : –Ve ; $\Delta S$ : –Ve ; Nature of reaction : Spontaneous only at low temperature

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A

$\Delta H$ : –Ve ; $\Delta S$ : +Ve ; Nature of reaction : Spontaneous at all temperature

B

$\Delta H$ : +Ve ; $\Delta S$ : –Ve ; Nature of reaction : Non spontaneous regardless of temperature

C

$\Delta H$ : +Ve ; $\Delta S$ : +Ve ; Nature of reaction : Spontaneous at high temperature

D

$\Delta H$ : –Ve ; $\Delta S$ : –Ve ; Nature of reaction : Spontaneous only at low temperature

$\Delta$ G = $\Delta$ H - T $\Delta$ S
$\Delta$ G = - Ve (for spontaneous reaction)