A reaction that is spontaneous can be described as:

A reaction that is spontaneous can be described as:
  1. proceeding in both the forward and reverse directions
  2. having the same rate in both the forward and reverse directions
  3. releasing heat to the surroundings
  4. proceeding without external influence once it has begun

Solution

A reaction that is spontaneous can be described as
(d) proceeding without external influence once it has begun. TRUE. A spontaneous reaction has a tendency to proceed in the way it has begun. It is spontaneous when Gibbs free energy is negative.
(c) releasing heat to the surroundings. FALSE. If the reaction is exothermic (enthalpy negative), one still has to take into account the effect of the entropy on Gibbs free energy.
(a) proceeding in both the forward and reverse directions. FALSE. This just means that the reaction is reversible.
(b) having the same rate in both the forward and reverse directions. FALSE. This is related to the kinetics but not the spontaneity.
So, the correct option is (d) ,

Asked in: JEE-TOPICTESTS-CHEMISTRY

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