ISC Class 12 Solutions — practice questions
42 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice ISC Class 12 Solutions in the app →A solution is described as 10% glucose in water by mass. The mass of water present in 100 g of this solution iWhich of the following concentration terms is dependent on temperature?Molality of a solution is defined as the number of moles of solute per:A solution contains 20% of ethylene glycol (C2H6O2, molar mass 62 g/mol) by mass in water. Taking 100 g of solCalculate the molarity of a solution containing 5 g of NaOH (molar mass 40 g/mol) in 450 mL of solution.Calculate the molality of a solution of 2.5 g of ethanoic acid (CH3COOH, molar mass 60 g/mol) in 75 g of benzeA litre of sea water weighing 1030 g contains about 6 x 10^-3 g of dissolved oxygen. The concentration of dissHenry's law for the dissolution of a gas in a liquid is most commonly expressed as:For a gas dissolving in a liquid at a given partial pressure, a higher value of the Henry's law constant KH inThe solubility of most gases in a liquid changes with temperature in which way, and why?N2 gas is bubbled through water at 293 K and exerts a partial pressure of 0.987 bar. If the Henry's law constaScuba divers breathing air at high pressure underwater may suffer from 'bends' on ascending. The gas chiefly rFor a binary solution of two volatile liquids 1 and 2, Raoult's law gives the partial vapour pressure of compoTwo volatile liquids have pure vapour pressures p1^0 = 200 mm Hg and p2^0 = 415 mm Hg. If the mole fraction ofIn the vapour above an ideal binary solution of two volatile liquids at equilibrium, the vapour phase is alwayRaoult's law can be regarded as a special case of Henry's law. This is true when the Henry's law constant KH bFor an ideal solution, the enthalpy of mixing and the volume of mixing of the pure components are respectivelyA liquid mixture shows positive deviation from Raoult's law. The intermolecular A-B interactions in this solutA mixture of chloroform and acetone forms a solution that shows negative deviation from Raoult's law. The reasA liquid mixture that shows a large positive deviation from Raoult's law will form which kind of azeotrope?Which of the following is NOT a colligative property of a solution?According to Raoult, the relative lowering of vapour pressure of a solvent over a solution containing a non-voThe vapour pressure of pure benzene is 0.850 bar. On dissolving 0.5 g of a non-volatile non-electrolyte in 39.The elevation of boiling point of a dilute solution is given by which expression, where m is molality and Kb t18 g of glucose (molar mass 180 g/mol) is dissolved in 1 kg of water. Given Kb for water is 0.52 K kg/mol and 1.80 g of a non-volatile solute in 90 g of benzene raises the boiling point from 353.23 K to 354.11 K. With KbThe depression of freezing point of a dilute solution is directly proportional to which quantity?45 g of ethylene glycol (molar mass 62 g/mol) is mixed with 600 g of water (Kf = 1.86 K kg/mol). The depressio1.00 g of a non-electrolyte dissolved in 50 g of benzene lowers its freezing point by 0.40 K. Given Kf = 5.12 The molal freezing point depression constant Kf of a solvent is related to its properties by which expression The osmotic pressure of a dilute solution is related to its molarity C and temperature T (R = gas constant) by200 cm^3 of an aqueous protein solution contains 1.26 g of protein and has an osmotic pressure of 2.57 x 10^-3Two solutions that have the same osmotic pressure at a given temperature are described as:A red blood cell placed in a solution containing more than 0.9% (mass/volume) sodium chloride will:The van't Hoff factor i is defined as the ratio of:For a solute that dissociates in solution and one that associates, the van't Hoff factor i is respectively:If 1 mol of KCl is dissolved in 1 kg of water and full dissociation is assumed (i = 2), the expected elevation2 g of benzoic acid (true molar mass 122 g/mol) in 25 g of benzene gives a freezing point depression of 1.62 KBenzoic acid (true molar mass 122 g/mol) dimerises in benzene and shows an observed molar mass of 242 g/mol. TFor acetic acid dissolved in water, the observed freezing point depression is 0.0205 K while the value calculaFor a weak acid HA that dissociates into one H+ and one A- ion, if the van't Hoff factor is 1.041, the degree At a given dilution, the van't Hoff factor i for complete dissociation approaches which value for K2SO4 in wat