AP EAPCET (Engineering) Surface Chemistry — practice questions
120 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice AP EAPCET (Engineering) Surface Chemistry in the app →The modern periodic law states that the physical and chemical properties of elements are periodic functions ofElements of the modern periodic table are classified into how many blocks based on the differentiating electroAcross a period from left to right, the atomic radius generally:Which element has the highest first ionization energy in period 2?Which of the following arrangements is in correct order of increasing electronegativity (Pauling scale)?The element with electronic configuration $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^3$ belongs to which group Solutions are homogeneous mixtures of two or more components. In a binary solution, the component present in tAn amalgam of mercury with sodium is an example of which type of solution?Which of the following concentration units is *temperature-dependent*?The sum of mole fractions of all components in a solution equals:Molality (m) is defined as:Calculate the molality of a solution prepared by dissolving 2.5 g of ethanoic acid (CH₃COOH, M = 60 g mol⁻¹) iThe molarity of a solution containing 5 g of NaOH (M = 40 g mol⁻¹) in 450 mL of solution is:The mole fraction of ethylene glycol (C₂H₆O₂, M = 62) in a 20% by mass aqueous solution is approximately:If sea water (density 1.03 g mL⁻¹) contains 5.8 g of dissolved O₂ per 10⁶ g of water, the concentration is bes'Like dissolves like' implies that:If dissolution of a solid in a liquid is endothermic (Δ_sol H > 0), the solubility will:Solubility of gases in liquids generally:To increase the solubility of CO₂ in soft drinks, manufacturers:Raoult's law for a solution of two volatile liquids states that the partial pressure of component 1 is:For a binary solution of volatile liquids, the total vapour pressure can be written as:Raoult's law in its general form, for the solvent in a solution of a non-volatile solute, gives the relative lFor an ideal solution, both the enthalpy of mixing and the volume of mixing are:Which of the following is an example of a near-ideal solution?Solutions showing large **positive deviation** from Raoult's law form which type of azeotrope?Ethanol–water mixture, on fractional distillation, gives an azeotrope at approximately:HNO₃–water mixture forms a *maximum* boiling azeotrope at composition:Which of the following is NOT a colligative property?The four colligative properties all originate from:Elevation of boiling point (ΔT_b) is related to molality (m) by:For water, K_b = 0.52 K kg mol⁻¹. What is the boiling point of a solution of 18 g glucose (M = 180) in 1 kg waDepression of freezing point (ΔT_f) is given by:45 g of ethylene glycol (M = 62) is dissolved in 600 g of water. K_f(water) = 1.86 K kg mol⁻¹. The depression The osmotic pressure (Π) of a dilute solution is given by:Two solutions are termed *isotonic* if they:Blood cells placed in a hypertonic solution (e.g., > 0.9% NaCl) will:Why do wilted flowers revive when placed in fresh water?The van't Hoff factor (i) for a solute that completely dissociates into n particles is:For benzoic acid dimerising in benzene (2 CH₃COOH ⇌ (CH₃COOH)₂), the van't Hoff factor approaches:Inclusion of the van't Hoff factor modifies the boiling point elevation formula to:Experimentally, a solute is found to have a molar mass *lower* than its formula mass. This indicates the solutIn an antifreeze formulation, 35% (v/v) ethylene glycol in water lowers the freezing point of water to about:Adsorption isotherm:Hydrogenation of vegetable oils to make margarine uses catalyst:According to VSEPR theory, the shape of a molecule is determined byThe hybridisation of carbon in methane (CH₄) isWhich molecule is non-polar despite having polar bonds?The bond order of the oxygen molecule O₂ (by molecular orbital theory) isA coordinate (dative) bond differs from a normal covalent bond in thatWhich species has sp hybridisation on the central atom?As bond order increases, bond lengthAn ionic bond forms byThe shape of NH₃ is pyramidal rather than planar becauseWhich has the highest dipole moment?Among the following, which is paramagnetic?Formal charge on an atom = 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?Which German physicist coined the word adsorption in 1881?Physisorption of a gas on a solid surface is characterised by which kind of force?Chemisorption is characterised mainly by which type of interaction?How does adsorption differ from absorption?Silica gel, a common drying adsorbent, is an amorphous form of which compound?The channel diameter of zeolite cages usually lies in which range?The Tyndall effect seen in many colloids is due to what process?Which pair are the two main ways of stabilising a colloid against aggregation?Why does adding salt coagulate a colloid?