Multiple choice Which one of the following colloidal system is represented by fog Gas in liquid Liquid in gas Solid in gas Liquid in liquid Reveal answer Fill a bubble to check yourself B Correct answer Explanation Fog is a colloidal system where liquid water droplets are dispersed in a gas (air). This makes it a 'liquid in gas' colloid. Examples include fog, mist, and sprays - where the dispersed phase is liquid and the dispersion medium is gas.