CBSE Class 12 (Science) Surface Chemistry — practice questions
83 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 12 (Science) Surface Chemistry in the app →The MOLARITY of a solution containing 58.5 g NaCl dissolved in 1 L of solution is:HENRY'S LAW states that at constant temperature:A MINIMUM-BOILING azeotrope arises from:Which of these is NOT a colligative property?Salt is sprinkled on icy roads in cold countries to:The van't Hoff factor (i) for sodium chloride (NaCl) in water is approximately:Molecules gathering at a surface rather than in the bulk is:The substance that gathers on the surface is the:The material on whose surface adsorption happens is the:Adsorption is essentially a phenomenon of the:Finely divided solids make good adsorbents because they have large:Charcoal shaken with a dye solution leaves the filtrate:Air is dried by silica gel because water molecules are:Removing an adsorbed substance from a surface is called:In absorption, against adsorption, the substance is spread:A chalk stick dipped in ink keeps ink colour on its surface by:The single term covering both adsorption and absorption is:Water vapour is absorbed by anhydrous calcium chloride but:Adsorption happens because surface particles carry forces that are:Adsorption releases heat, so the process is always:A gas losing freedom of movement on adsorption shows a fall in:Adsorption held by weak van der Waals forces is called:Adsorption held by chemical bonds is called:Chemisorption needs a high energy of activation, so it is also called:Physisorption shows no preference for a particular gas, so it lacks:Physical adsorption of a gas by a solid is generally:Chemisorption involves compound formation, so it is usually:Gases that are easily liquefied are adsorbed:What is the adhesion of gas or liquid molecules onto a surface called?In adsorption, what is the material that forms the film on the surface called?What happens to the fluid in absorption, unlike in adsorption?Adsorption is described as a direct consequence of which property?Why can atoms at the surface of an adsorbent attract adsorbates?An adsorption isotherm shows the amount adsorbed against pressure at what condition?What kind of formula is the Freundlich gas isotherm?Adsorbed quantity is normally normalised by which property of the adsorbent?Silica gel is chemically which form of silicon dioxide?Zeolites used as adsorbents are best described as what?Activated carbon is best described as which type of adsorbent?Which adsorbent is typically hydrophilic and polar?Silica gel is commonly used in industry for which purpose?Why must industrial adsorbents have small pore diameters?Which is a common raw material for making activated carbon?Making activated carbon involves which two phases?In a colloid, what are the suspended particles collectively called?The scattering of light by colloidal particles is called what?IUPAC places the colloidal dimension roughly between which two sizes?How many phases does a true solution have, compared with a colloid?In milk viewed as a colloid, the dispersed particles are what?Hydrocolloids are mostly made of which kinds of chemicals?Breaking large particles down by milling to colloidal size is which method?Which stabilisation relies on repulsion of like charges?Electrostatic repulsion between colloidal particles is best quantified using what?Steric stabilization works by doing what to particles?The clumping together of colloidal particles is generally called what?Adding salt to a colloid destabilises it by reducing which quantity?Which statement is true about the colloidal gel in toothpaste under shear?What charge do counterions around a charged colloid particle carry?A colloid stays stable if attractive interaction energy is below what?Dynamic light scattering finds colloid particle size by measuring what?Xanthan and guar gum stabilise colloids by which method?An emulsion is a dispersion in which both phases are in which state?In an oil-in-water emulsion, which liquid is the dispersed phase?An emulsifier stabilises an emulsion by doing what at the interface?Why are surfactant molecules called amphiphilic?Which compound is the main emulsifier in egg yolk?Milk is a natural example of which kind of colloid?Which is one of the four types of instability in emulsions?Emulsions with droplets below about 100 nm usually appear how?Why do most emulsions look cloudy?The word emulsion comes from a Latin verb meaning what?How do soaps and detergents help remove grease?A photographic emulsion consists of what dispersed in gelatin?What happens to a catalyst during the reaction it speeds up?A catalyst speeds a reaction by providing a path with what?What effect does a catalyst have on chemical equilibrium?In homogeneous catalysis, the catalyst is in which phase relative to reactants?Which metal is the basis of the catalyst in the Haber ammonia process?Why does reducing catalyst particle size raise its activity per gram?Biological catalysts called enzymes are mostly made of which molecules?Which term is used for substances that irreversibly lower catalyst activity?What are promoters in catalysis?In a Lindlar catalyst, palladium is partly poisoned with what?