Question

In which of the following change entropy decreases?

• A. Crystallisation of sucrose from solution
• B. Dissolving sucrose in water
• C. Melting of ice
• D. Vaporisation of camphor

Answer 1

The correct option is A Crystallisation of sucrose from solution

The process involving change by creating restriction in movement of molecules will be the one in which entropy decreases.
This is because the entropy is measure of randomness. And as the movement gets restricted due to changes made, hence the entropy of the system decreases.
Since, in crystallisation of sucrose from solution, the free sucrose movements gets restricted inside the crystal lattice.
Hence, its entropy decreases.
Hence, answer is option A.