Question

Which of the following is NOT soluble in water?

• A. Salt
• B. Sugar
• C. Oxygen
• D. Sand

Answer 1

Answer: (D)

Salt is an ionic compound that is formed by a cation and anion. The ionic species have dipole-dipole attraction with water molecules and are therefore soluble.

Sugar is a polyhydroxy compounds. The hydrogen bonding between water and $OH$ groups makes sugar soluble.

Oxygen is water soluble gas as being small molecule, gets trapped in water molecules and is utilized by water organisms for sustenance.

Sand is a naturally occurring granular material composed of finely divided rock and mineral particles. It forms a dispersion with water and settles down with time. It is insoluble in water.

Option D is correct