Question

ΔG is negative for which of the following processes?

(a) Melting of ice and evaporation of water

(b) Oxidation of nitrogen

(c) Oxidation of gold

(d) Burning of chlorine

I got this question in a national level competition.

The above asked question is from Weak Interactions in Aqueous Systems in section Water Basics of Biochemistry

Answer 1

The correct option is (a) Melting of ice and evaporation of water

The best I can explain: The Gibb’s free energy change (ΔG) must have a negative value for a process to occur spontaneously.

Melting of ice and evaporation of water are the two spontaneous processes at room temperature.