A reaction is spontaneous at all temperature if ____________
A. \(\Delta G =0\) B. \(\Delta G >0\) C. \(\Delta S <0\) and \(\Delta H >0\) D. \(\Delta S >0\) and \(\Delta H <0\)
Correct Answer: D
Explanation
(i) If \(\Delta H\) is positive \((\Delta H>0)\) and \(\Delta S\) is negative, regardless of temperature. (ii) If \(\Delta H\) is negative \((\Delta H <0)\) and \(\Delta S\) is positive \((\Delta S >\) \(0)\), then \(\Delta G\) will always be negative, regardless of temperature Since \(\Delta G\) must he negative \((\Delta G<0)\) for spontancity, condition (ii) is required for temperature - non - dependent spontaneity of the reaction