Question

When $S{O_2}$ gas is bubbled into ${H_2}S$ gas:
A.lyophilic sol of sulphur is formed
B.lyophobic sol of sulphur is formed
C.suspension of water and sulphur is formed
D.a true solution of sulphur in water is formed

Answer 1

Colloids are mixtures in which microscopically dispersed insoluble particles of one substance are suspended in another substance. The particles of a colloid remain dispersed and do not settle due to gravity, and they are often electrically charged.

Complete answer: The types of colloids are sol, emulsion, foam, and aerosol. Sol is a colloidal suspension with solid particles in a liquid. Emulsion is between two liquids. Foam is formed when many gas particles are trapped in a liquid or solid. Aerosol contains small particles of liquid or solid dispersed in a gas.
Lyophilic Colloids are the colloidal solutions in which dispersed particles have strong affinity for dispersion medium. These sols are stable and reversible. Some examples are starch, gum, gelatin sol etc. Lyophobic Colloids are the colloidal solutions in which the dispersed phase has no affinity for the dispersion medium.
All particles in a lyophobic sol have the same charge. Particles in the lyophilic sol absorb ${H^ + }$ and $O{H^ - }$ ions from the medium. Particles in a lyophobic sol absorb ions from the medium. Particles in a lyophilic sol may or may not migrate towards the electrode.
When $S{O_2}$​ gas is bubbled into ${H_2}S$ gas, lyophobic sol of sulphur is formed.
$2{H_2}S + S{O_2} \to 2{H_2}O + 3S$(colloidal).
Hence, the correct option is B.

Note:
Note that colloids are also known as colloidal solutions or colloidal systems. Also note that, a solution is always transparent, light passes through with no scattering from solute particles which are molecules in size. The solution is homogeneous and does not settle out. A colloid is intermediate between a solution and a suspension. While a suspension will separate out a colloid will not.