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51.	An emulsion is a type of colloid.(a) True(b) FalseThe question was asked in semester exam.This interesting question is from Surface Chemistry topic in division Surface Chemistry of Chemistry – Class 12
Answer» The correct choice is (a) True The EXPLANATION: An emulsion is a COLLOIDAL DISPERSION in which both the dispersed phase and the dispersion medium are liquids. It is a suspension of two liquids that USUALLY do not mix. These liquids that do not mix are said to be immiscible.

52.	When hit by light, what happens to a colloidal mixture?(a) Absorbed(b) Reflected(c) Diffracted(d) Passes throughThe question was asked in examination.The above asked question is from Surface Chemistry topic in division Surface Chemistry of Chemistry – Class 12
Answer» Correct choice is (c) Diffracted The explanation is: When light STRIKES a colloidal mixture, it is reflected off the LARGE particles and spreads out. It is so because the colloidal particles MOVE RAPIDLY and randomly. This is what happens when light hits a mixture.

53.	Which of the following is not a method to test the type of emulsion?(a) Microscopic method(b) Conductance method(c) Coagulation method(d) Dye methodThis question was posed to me during an interview.This interesting question is from Surface Chemistry in chapter Surface Chemistry of Chemistry – Class 12
Answer» The correct answer is (C) Coagulation method Explanation: Coagulation or precipitation is a process of aggregating together the colloidal particles to CHANGE them into large-sized particles which ultimately settle as a PRECIPITATE. The different methods to test the type of emulsion are-microscopic, CONDUCTANCE and dye method.

54.	In which of the following, the dispersed phase and medium can be separated by evaporation?(a) Ferric hydroxide solution(b) Sulphur solution(c) Metal in water(d) Starch solutionThe question was posed to me in an online quiz.The query is from Surface Chemistry topic in section Surface Chemistry of Chemistry – Class 12
Answer» Right answer is (d) STARCH solution Easiest EXPLANATION: In starch solution, if the dispersed phase and the dispersion medium are separated by EVAPORATION, the colloidal solution can be regained by remixing the dispersed phase and dispersion medium. Hence these are called reversible solutions are highly STABLE because of the high INTERACTION between the dispersed phase and medium.

55.	Dust is a colloid.(a) True(b) FalseI have been asked this question in my homework.My question is from Surface Chemistry topic in portion Surface Chemistry of Chemistry – Class 12
Answer» Correct choice is (a) True For explanation: Yes, the statement is true. Dust is a colloid if suspended in the AIR. It consists of a solid in a gas which is PRESENT in the atmosphere and it comes under the category of aerosols (CONTAINS SMALL particles of LIQUID or solid dispersed in a gas).

56.	Colloids are responsible for the blue colour of the sky and sea water.(a) True(b) FalseThis question was posed to me during an interview.I'd like to ask this question from Surface Chemistry in chapter Surface Chemistry of Chemistry – Class 12
Answer» The correct ANSWER is (a) True Easiest explanation: There are a lot of suspended impurities in the atmosphere and sea water that act as COLLOIDS. DUE to Tyndall EFFECT and Rayleigh scattering, these colloidal particles SCATTER blue light and hence, make them appear blue in colour.

57.	Which of the following is an example of sorption?(a) Sponge in water(b) Cotton dipped in ink(c) Water on silica gel(d) Oxygen on metal surfaceThis question was addressed to me in an interview for internship.This interesting question is from Surface Chemistry topic in chapter Surface Chemistry of Chemistry – Class 12
Answer» The CORRECT option is (b) Cotton dipped in ink To explain I would SAY: Sorption refers to the process where ADSORPTION and ABSORPTION OCCUR at the same time. Cotton dipped in ink is one of the cases where both adsorption and absorption, that is, sorption occurs.

58.	What is the dispersion of a liquid in another liquid called?(a) Gel(b) Foam(c) Emulsion(d) AerosolI got this question by my college professor while I was bunking the class.Question is from Surface Chemistry topic in portion Surface Chemistry of Chemistry – Class 12
Answer» Correct option is (c) Emulsion To explain: The dispersion of a liquid in a SOLID is called gel. The dispersion of a gas in a liquid medium is called foam. The dispersion of a liquid in another liquid is called emulsion. The dispersion of a solid or liquid in a GASEOUS medium is called AEROSOL.

59.	A finely divided substance is more effective as an adsorbent.(a) True(b) FalseThe question was posed to me in an internship interview.I want to ask this question from Surface Chemistry in portion Surface Chemistry of Chemistry – Class 12
Answer» The correct CHOICE is (a) True The BEST I can EXPLAIN: Adsorption is a surface phenomenon. It is dependent on the amount of the adsorbent exposed to the ADSORBATE. A FINELY divided substance provides a large surface area and hence, provides more sites where adsorption can take place.