NEET UG Solutions — practice questions
89 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice NEET UG Solutions in the app →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:Henry's law states that, at a constant temperature, the partial pressure (p) of a gas above a solution is:The Henry's law constant (K_H) values for N₂ at 293 K and 303 K are 76.48 and 88.84 kbar respectively. This shScuba divers ascending from depth too quickly may suffer from the 'bends', caused by:To increase the solubility of CO₂ in soft drinks, manufacturers:Anoxia, observed in high-altitude climbers, is best explained by: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:At equilibrium, the vapour phase above a liquid solution is always richer in the component that: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?A solution shows **positive deviation** from Raoult's law when:A solution of chloroform and acetone shows **negative deviation** from Raoult's law because:Solutions showing large **positive deviation** from Raoult's law form which type of azeotrope?Azeotropes are binary mixtures that: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 Which property allows osmotic pressure to be especially useful for determining the molar mass of macromoleculeThe 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:
0.9% (mass/volume) sodium chloride solution is called the 'normal saline solution' because:A gas in contact with a liquid shows the following behavior at constant temperature: when $P = 1\ \text{atm}$,A gas is dissolved in a liquid under conditions where Henry's law is valid. Which change would most directly rAt fixed pressure, the solubility of a gas in a liquid decreases when the value of Henry's law constant increaA student states: 'More the pressure of a gas over a liquid, more gas is dissolved.' This statement is an applWhich of the following gas-liquid pairs is least likely to obey Henry's law directly because chemical reactionA dissolved gas obeys Henry's law: $P = K_H x$. If the pressure above the solution is doubled while $K_H$ remaA gas has $K_H = 5\ \text{atm}$ in a given liquid at a certain temperature. If the partial pressure of the gasAt constant temperature, two gases A and B are dissolved separately in the same liquid under the same pressureWhich set of factors listed below affects the value of Henry's law constant $K_H$ for a gas in a liquid?Why is Henry's law generally applied to dilute solutions of gases in liquids?Which of the following is a necessary condition for the direct application of Henry's law?A gas obeys Henry's law in water at a fixed temperature. If $K_H$ for the gas-liquid system is large, what doeAccording to Henry's law, which expression correctly relates the partial pressure $P$ of a gas above a solutioFor a gas dissolved in a liquid, Henry's law can be written as $P = K_H x$, where $x$ is the mole fraction of The solubility of a gas in a liquid generally:A $0.5$ molal aqueous solution of a non-electrolyte ($K_b = 0.52$ K kg/mol for water) boils at:A solution of $0.1$ M sucrose at $300$ K has osmotic pressure (using $R = 0.0821$ L atm/(mol K)):The van't Hoff factor $i$ for $0.1$ m NaCl (assuming complete dissociation) is:The MOLARITY of a solution containing 58.5 g NaCl dissolved in 1 L of solution is:The KEY DIFFERENCE between molarity (M) and molality (m) is that: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 OSMOTIC PRESSURE π of a dilute solution is given by:The van't Hoff factor (i) for sodium chloride (NaCl) in water is approximately:Raoult's law for an ideal solution of two volatile components states:The mole fraction of ethylene glycol in a 20 % (w/w) aqueous solution (molar masses: glycol 62, water 18) is c5 g of NaOH (molar mass 40 g/mol) is dissolved in 450 mL solution. The molarity is closest toWhich of the following concentration units of a solution is temperature-dependent?Molality of a solution containing 2.5 g of ethanoic acid (CH₃COOH, M = 60 g/mol) in 75 g of benzene is closestHenry law states that the partial pressure of a gas in solution isFor a solution of a non-volatile solute, Raoult law implies that the vapour pressure of the pure solventFor an ideal binary liquid solution, Raoult law gives the total vapour pressure asWhich of the following is NOT a colligative property?If a solute dimerises in solution, its observed molar mass compared with the calculated value will beA negative deviation from Raoult law is expected whenVan't Hoff factor i > 1 for a solute indicatesOsmotic pressure π of a dilute solution obeys π = C R T. Here C representsThe molality of a 1 M aqueous NaCl solution (density = 1.04 g/mL, NaCl M = 58.5 g/mol) is closest toWhich of these solutions will boil at the highest temperature at 1 atm?The mass of NaOH (M = 40 g/mol) required to prepare 500 mL of a 0.20 M NaOH solution is