Which of the following statements is true about
a colloidal system?
(a) It carries a net electric charge
(b) It consists of one phase only
(c) It can be made out of two gases
(d) It is electrically neutral as a whole
Answers
Answer:
b) It consists of one phase only
Explanation:
Colloidal particles may acquire electric charge due to the presence of certain acidic or basic groups in colloidal solution. For instance, protein molecules give rise to formation of colloidal solutions. Thus the particles of protein sol either have positive charge or negative charge depending upon the PH of medium.
Unlike a solution, whose solute and solvent constitute only one phase, a colloid has a dispersed phase (the suspended particles) and a continuous phase (the medium of suspension) that arise by phase separation. ... The cytoplasm of living cells is an example of a colloid, containing many types of biomolecular condensate.
When the gases are mixed it forms a mixture of homogenous gas atoms, here the dispersed phase is gas and the dispersion medium is also gas, which can be called as solution rather than colloidal system as the mixture of gases forms translucent and transparent medium.
A colloidal solution as a whole is electrically neutral in nature i.e., dispersion medium carries an equal and opposite charge to that of the particles of dispersed phase.