Home / Unit-8 Energetics / Question
MCQ
Which statement about the spontaneity of reactions is most correct?
Unit-8 Energetics
A All exothermic reactions are spontaneous
B All endothermic reactions are non-spontaneous
C Reactions that release energy generally tend to occur spontaneously, but other factors such as disorder also matter
D Activation energy alone decides spontaneity
Explanation

Energy release favours spontaneity, but factors like disorder (entropy) can also make some endothermic reactions spontaneous.

Related MCQs

Heat energy flows spontaneously from a:
Unit-8 Energetics View
At ordinary conditions, a reaction that tends to occur without external help usually:
Unit-8 Energetics View
For the reaction A + B -> C, delta H = +120 kJ. If the equation is doubled (2A + 2B -> 2C), the delta H becomes:
Unit-8 Energetics View
Which of the following has a positive delta H value?
Unit-8 Energetics View
Some endothermic processes, such as evaporation of water, still occur spontaneously because they:
Unit-8 Energetics View
Which of the following is an example of an exothermic reaction?
Unit-8 Energetics View