Solutions

CBSE Class 12 Chemistry · every board question from this chapter, 2023–2026 · 44 of them repeated across years

• The mole fraction of a solute in 2.0 molal aqueous solution is:2026asked 3×
• Which of the following is the correct expression of K f which depends upon the nature of solvent?2026
• Which of the following solutions will have the lowest freezing point in water?2026
• Which of the following solutions will have the highest osmotic pressure?2026
• The boiling point of one molal NaCl solution, assuming NaCl to be completely dissociated in water is: (K b. for water.=0.52 K kg…2026asked 3×
• When a liquid and its vapour are at equilibrium and the pressure is suddenly decreased:2026asked 3×
• The boiling point of an azeotropic mixture of water and ethanol is less than that of pure water and ethanol. The mixture shows:2026
• The boiling point of an azeotropic mixture of water and nitric acid is more than that of pure water and nitric acid. The mixture…2026
• 1 mole of liquid A and 2 moles of liquid B make a solution having a total vapour pressure 40 torr. The vapour pressure of pure A…2026
• Assertion: It is not possible to separate the components of an azeotrope by fractional distillation. Reason (R): Components of an…2026
• Assertion: Components of azeotropes are easily separated by fractional distillation. Reason (R): Components of an azeotrope have…2026
• Assertion: It is not possible to separate the components of an azeotrope by fractional distillation. Reason (R): Minimum boiling…2026
• 1.00 molal aqueous solution of trichloroacetic acid is heated to its boiling point. Boiling point of this solution was found to…2026
• What type of deviation is shown by a mixture of chloroform and acetone from Raoult's law? Give reason. What will happen to the…2026
• What type of deviation from Raoult's law is shown by a mixture of phenol and aniline? Give reason. What will happen to the…2026
• What type of deviation from Raoult's law is shown by mixture of ethanol and acetone? Give reason. What will happen to the boiling…2026
• Explain the following with the help of Henry's law: (i) Bends (ii) Anoxia OR How does sprinkling of salt help in clearing the…2026asked 3×
• Explain why, on addition of 1 mol of KCl to 1 litre of water, the boiling point of water increases, while the addition of 1 mol…2026asked 3×
• A solution containing 8.0 g of a non-volatile solute in 100 g of diethyl ether boils at 36.86 °C whereas pure diethyl ether boils…2026
• 60 g of glucose is dissolved in 250 g of water. Calculate the freezing point of this solution. ( molar mass of glucose =180 g…2026
• When 1.5 g of a non-volatile solute was dissolved in 90 g of benzene, the boiling point of benzene got raised from 353.23 K to…2026
• Calculate the boiling point of a solution containing 0.61 g of benzoic acid (Molar mass =122 g mol^-1 ) in 5 g of CS 2 in which…2026asked 3×
• An antifreeze solution is prepared by dissolving 31 g of ethylene glycol (Molar mass =62 g mol^-1 ) in 600 g of water. Calculate…2026asked 3×
• Calculate the vapour pressure of a solution containing 61 g of benzoic acid (molar mass =122 g mol^-1 ) dissolved in 500 g of…2026asked 3×
• Osmosis is a process by which the molecules of a solvent pass from a solution of low solute concentration to a solution of high…2026asked 3×
• (i) Calculate the freezing point of a solution when 10 · 5 g of MgBr 2 was dissolved in 250 g of water, assuming MgBr 2 undergoes…2026asked 3×
• In case of association, abnormal molar mass of solute will2025asked 3×
• Which of the following solution in water will have the lowest freezing point?2025
• Which of the following solutions will have the highest boiling point in water?2025
• Which of the following aqueous solutions will have the highest osmotic pressure?2025
• The value of Henry's constant K H is:2025asked 3×
• Which of the following aqueous solutions will have the highest freezing point?2025asked 3×
• A solution of acetone in chloroform:2025
• The freezing point of one molal KCl solution, assuming KCl to be completely dissociated in water, is: (K f. for water.=1.86 K kg…2025asked 3×
• On mixing 30 mL of acetone with 20 mL of chloroform, the total volume of solution is:2025
• A solution of acetone in ethanol:2025
• An unripe mango placed in a concentrated salt solution to prepare pickle, shrivels because.2025asked 3×
• Assertion: Cooking time is reduced in pressure cooker. Reason (R): Boiling point of water inside the pressure cooker is elevated.2025
• Assertion: Aquatic species are more comfortable in cold water than in warm water. Reason (R): Solubility of oxygen gas in water…2025
• Assertion: Henry's law constant (K H) decreases with increase in temperature. Reason (R): As the temperature increases,…2025asked 3×
• Give reasons: Cooking is faster in pressure cooker than in an open pan. On mixing liquid X and liquid Y, volume of the resulting…2025asked 3×
• Define osmotic pressure. Why is measurement of osmotic pressure method preferred for the determination of molar masses of…2025
• State Raoult's law for a solution containing volatile components. Why is the vapour pressure of an aqueous solution of glucose…2025
• What is meant by negative deviation from Raoult's law? Give an example. What type of azeotrope is formed by negative deviation?2025
• What is meant by positive deviation from Raoult's law? Give an example. What type of azeotrope is formed by positive deviation?2025
• Calculate the elevation of boiling point of a solution when 3 g of CaCl 2(. Molar mass.=111 g mol^-1) was dissolved in 260 g of…2025asked 3×
• State Henry's law. Why are aquatic species more comfortable in cold water as compared to warm water?2025
• A and B liquids on mixing show rise in temperature. Which type of deviation from Raoult's law is there and why? Why can…2025
• A solution of glucose (molar mass =180 g mol^-1 ) in water has a boiling point of 100.20^° C. Calculate the freezing point of the…2025
• Shweta mixed two liquids A and B of 10 mL each. After mixing, the volume of the solution was found to be 20 · 2 mL. (i) Why was…2025asked 3×
• Henry's law constant for CO 2 in water is 1.67 × 10^8 Pa at 298 K. Calculate the number of moles of CO 2 in 540 g of soda water…2025
• At 25 °C the saturated vapour pressure of water is 24 mm Hg. Find the saturated vapour pressure of a 5% aqueous solution of urea…2025
• A solution containing 15 g urea (molar mass =60 g mol^-1 ) per litre of solution in water has the same osmotic pressure…2025asked 2×
• Henry's law constant for CO 2 in water is 1.67 × 10^8 Pa at 298 K. Calculate the number of moles of CO 2 in 500 ml of soda water…2025
• An aqueous solution of NaOH was made and its molar mass from the measurement of osmotic pressure at 27^° C was found to be 25 g…2025asked 2×
• Vapour pressure of pure water at 298 K is 24.8 mm Hg. Calculate the lowering in vapour pressure of an aqueous solution which…2025asked 3×
• An aqueous solution of NaOH was made and its molar mass from the measurement of osmotic pressure at 25^° C was found to be 28 g…2025
• The spontaneous flow of the solvent through a semipermeable membrane from a pure solvent to a solution or from a dilute solution…2025asked 3×
• According to the generally accepted definition of the ideal solution there are equal interaction forces acting between molecules…2025asked 3×
• Van't Hoff factor for K 2 SO 4 solution, assuming complete ionization is2024
• The system that forms maximum boiling azeotrope is:2024
• For an electrolyte undergoing association in a solvent, the van't Hoff factor:2024
• Phenol dimerises in benzene having van't Hoff factor 0 · 54. Its degree of association is:2024
• Isotonic solutions have the same2024asked 3×
• Van't Hoff factor for KCl solution assuming the complete dissociation is2024
• An azeotropic solution of two liquids has boiling point higher than either of them when it:2024
• An azeotropic solution of two liquids has boiling point lower than either of them when it:2024
• On mixing 10 mL of acetone with 50 mL of chloroform, the total volume of the solution will be:2024
• The relative lowering of vapour pressure of an aqueous solution containing non-volatile solute is 0.0225. The mole fraction of…2024asked 3×
• A 1% solution of solute 'X' is isotonic with a 6% solution of sucrose (molar mass =342 g mol^-1 ). The molar mass of solute ' X '…2024asked 3×
• Van't Hoff factor for Na 2 SO 4 · 10 H 2 O solution, assuming complete ionization is2024
• Assertion: Addition of ethylene glycol to water lowers its freezing point. Reason (R): Ethylene glycol is insoluble in water due…2024
• Assertion: When NaCl is added to water a depression in freezing point is observed. Reason (R): NaCl undergoes dissociation in…2024
• Assertion: Δ mix H and Δ mix V are zero for an ideal solution. Reason (R): The solution which obeys Raoult's law over the entire…2024
• Assertion: Δ mix H and Δ mix V are zero for non-ideal solutions. Reason (R): Solute-solvent interactions are not same as pure…2024
• Assertion: Δ mix H for an ideal solution is not equal to zero. Reason (R): A - B interactions in an ideal solution are same as…2024
• Assertion: When NaCl is added in water, elevation in boiling point is observed. Reason (R): Elevation in boiling point is a…2024
• A 6% solution of glucose (molar mass=180 g mol^-1 ) is isotonic with 2.5% solution of an unknown organic substance. Calculate the…2024
• Define molal depression constant. How is it related to enthalpy of fusion? OR What type of deviation is shown by ethanol and…2024asked 3×
• 18 g of a non-volatile solute is dissolved in 200 g of H 2 O freezes at 272.07 K. Calculate the molecular mass of solute ( K f…2024
• A solution containing 60 g of a non-volatile solute in 250 g of water freezes at 270.67 K. Calculate the molar mass of the…2024
• Calculate the molar mass of a compound when 6.3 g of it is dissolved in 27 g of chloroform to form a solution that has a boiling…2024
• A 3%solution of glucose (molar mass =180 g mol^-1 ) is isotonic with 2.5% solution of an unknown organic substance. Calculate the…2024
• A 4% solution of urea (molar mass =60 g mol^-1 ) is isotonic with 5.2% solution of an unknown organic substance. Calculate the…2024
• A solution is prepared by dissolving 5 g of a non-volatile solute in 200 g of water. It has a vapour pressure of 31.84 mm Hg at…2024asked 3×
• The vapour pressure of a solvent at 283 K is 100 mm Hg. Calculate the vapour pressure of a dilute solution containing 1 mole of a…2024asked 3×
• (i) At the same temperature, CO 2 gas is more soluble in water than O 2 gas. Which one of them will have higher value of K H and…2024asked 3×
• (i) Define reverse osmosis. (ii) Why are aquatic species more comfortable in cold water in comparison to warm water? (iii) A…2024asked 3×
• (i) Ishan's automobile radiator is filled with 1.0 kg of water. How many grams of ethylene glycol (Molar mass =62 g mol^-1 ) must…2024asked 3×
• A compound undergoes complete tetramerization in a given organic solvent. The Van't Hoff factor ' i ' is:2023
• The colligative property used for the determination of molar mass of polymers and proteins is:2023asked 3×
• A compound CaCl 2 · 6 H 2 O undergoes complete dissociation in water. The Van't Hoff factor 'i' is:2023
• A compound undergoes complete dimerization in a given organic solvent. The Van't Hoff factor ' i ' is:2023
• Low concentration of oxygen in the blood and tissues of people living at high altitude is due to:2023asked 2×
• Value of Henry's constant K H:2023
• Which of the following aqueous solution will have highest boiling point?2023
• 1 mole of liquid A and 2 moles of liquid B make a solution having a total vapour pressure 40 torr. The vapour pressure of pure A…2023
• Solubility of gas in liquid decreases with increase in2023
• An azeotropic mixture of two liquids will have a boiling point lower than either of the two liquids when it2023
• Out of the following 1.0 M aqueous solutions, which one will show largest freezing point depression?2023
• An azeotropic mixture of two liquids has a boiling point higher than either of the two liquids when it:2023asked 3×
• If molality of a dilute solution is doubled, the value of the molal elevation constant (K b) will be2023
• Which one of the following pairs will not form an ideal solution?2023
• Isotonic solutions have:2023
• Assertion: Osmotic pressure is a colligative property. Reason (R): Osmotic pressure is proportional to the molality.2023
• Assertion: When NaCl is added to water, a depression in freezing point is observed. Reason (R): The vapour pressure of solution…2023
• Assertion: When glucose is added to water, an elevation in boiling point is observed. Reason (R): The lowering of vapour pressure…2023
• Assertion: The enthalpy of mixing Δ mix H is equal to zero for an ideal solution. Reason (R): For an ideal solution the…2023
• Assertion: Elevation in boiling point is a colligative property. Reason (R): The lowering of vapour pressure of solution causes…2023
• Assertion: When NaCl is added to water, a depression in freezing point is observed. Reason (R): The lowering of vapour pressure…2023
• What is Henry's law? Give one application of it.2023asked 2×
• A solution is prepared by dissolving 10 g of non-volatile solute in 200 g of water. It has a vapour pressure of 31.84 mm Hg at…2023
• The vapour pressure of pure liquid X and pure liquid Y at 25 °C are 120 mm Hg and 160 mm Hg respectively. If equal moles of X and…2023asked 3×
• What type of deviation from Raoult's law is shown by a mixture of ethanol and acetone? Give reason. OR Define Azeotrope. What…2023asked 3×
• What type of deviation from Raoult's law is shown by a mixture of ethanol and acetone? Give reason.2023
• On mixing liquid X and liquid Y, volume of the resulting solution decreases. What type of deviation from Raoult's law is shown by…2023
• Give reasons for the following: 2 Aquatic animals are more comfortable in cold water in comparison to warm water. Sprinkling of…2023
• Give reason: Measurement of osmotic pressure method is preferred for the determination of molar masses of macromolecules such as…2023
• Differentiate between Ideal solution and Non-ideal solution. 30 g of urea is dissolved in 846 g of water. Calculate the vapour…2023asked 2×
• When 19.5 g of F-CH 2-COOH(. Molar mass.=78 g mol^-1), is dissolved in 500 g of water, the depression in freezing point is…2023asked 3×
• 0.3 g of acetic acid (M=60 g mol^-1) dissolved in 30 g of benzene shows a depression in freezing point equal to 0.45^° C.…2023asked 6×
• If benzoic acid (M=122 g mol^-1) is associated into a dimer when dissolved in benzene and the osmotic pressure of a solution of…2023asked 3×
• (i) Why is boiling point of 1 M NaCl solution more than that of 1 M glucose solution? (ii) A non-volatile solute 'X' (molar mass…2023asked 3×

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