Free NEET Chemistry multiple-choice questions on Concentration Terms. Attempt each question and reveal the answer with a full explanation.
Which of the following concentration terms is independent of temperature? Molality Molarity Normality Formality What is the molality of a solution prepared by dissolving 4.5 ,g of glucose ( C 6H 12 O 6 , Molar mass = 180 ,g/mol ) in 250 ,g of water? 0.10 m 0.25 m 0.05 m 0.40 m What is the mole fraction of ethanol in a solution prepared by mixing 46 ,g of ethanol ( C 2H 5OH ) and 18 ,g of water ( H 2O )? 0.5 0.4 0.6 1.0 A concentration of 10 ,ppm (parts per million) by mass means: 10 g of solute in 10 6 g of solution 10 g of solute in 10 6 g of solvent 10 mg of solute in 10 3 g of solution 10 mg of solute in 10 6 g of solution What is the mole fraction of ethanol ( C 2H 5OH ) in a solution containing 46 % by mass of ethanol in water? 0.25 0.46 0.50 0.75 Which concentration term remains unaffected by the change in temperature? Mass percentage Molarity Normality Formality What is the normality of 0.3 M phosphorus acid ( H 3PO 3 )? 0.6 N 0.3 N 0.9 N 0.1 N According to the principle of 'like dissolves like', iodine ( I 2 ) is more soluble in which of the following? Carbon tetrachloride (CCl4) Water (H2O) Ethanol (C2H5OH) Liquid Ammonia (NH3) Which of the following is an example of a solid-in-solid solution? Copper dissolved in gold Camphor in nitrogen gas Solution of hydrogen in palladium Amalgam of mercury with sodium For the spontaneous dissolution of a solid in a liquid at constant temperature and pressure, which of the following must be true? G mix < 0 S mix < 0 V mix > 0 H mix = 0 Which concentration unit is most suitable for expressing the concentration of trace pollutants in drinking water? ppm Molarity Molality Mole fraction The unit of molality ( m ) is: mol/kg mol/L g/L No units In a binary solution, if the mole fraction of the solvent is 0.8 , the ratio of the moles of solute to moles of solvent is: 1:4 4:1 1:5 1:8 What is the molarity of a solution obtained by mixing 250 ,mL of 0.5 ,M ,HCl and 750 ,mL of 2 ,M ,HCl ? 1.625 M 1.250 M 0.875 M 1.750 M Which one of the following forms micelles in aqueous solution above certain concentration - Glucose Urea Dodecyl trimethyl ammonium chloride Pyridinium chloride The mole fraction of the solute in one molal aqueous solution is :- 0.027 0.036 0.018 0.009 How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO3 ? The concentrated acid is 70 % HNO3 . 45.0 g conc. HNO3 90.0 g conc. HNO3 70.0 g conc. HNO3 54.0 g conc. HNO3 The method used to remove temporary hardness of water is : Synthetic resins method Calgon's method Clark's method Ion-exchange method The right option for the statement "Tyndall effect is exhibited by", is : Glucose solution Starch solution Urea solution NaCl solution In one molal solution that contains 0.5 mole of a solute, there is 500 g of solvent 100 mL of solvent 1000 g of solvent 500 mL of solvent Match List-I with List-II array ll List-I (Example) & List-II (Type of Solution) A. Humidity & I. Solid in solid B. Alloys & II. Liquid in gas C. Amalgams & III. Solid in gas D. Smoke & IV. Liquid in solid array Choose the correct answer from the options given below: A-III, B-II, C-I, D-IV A-II, B-IV, C-I, D-III A-II, B-I, C-IV, D-III A-III, B-I, C-IV, D-II What is the mole fraction of the solute in a 1.00 molal aqueous solution? 0.0177 0.1770 1.7700 0.0344 The molarity of pure water at 4 C is: 55.5 M 18 M 1.0 M 100 M Calculate the molality of a 10 % ,(w/w) aqueous solution of NaOH . (Molar mass of NaOH = 40 ,g/mol ) 2.77 m 2.50 m 1.00 m 3.12 m A solution containing 10 g per dm 3 of urea (molar mass = 60 g/mol ) is isotonic with a 5 % (w/v) solution of a non-volatile solute. The molar mass of this non-volatile solute is: 300 g/mol 350 g/mol 200 g/mol 250 g/mol The mole fraction of a solute in a 2.5 molal aqueous solution is: 0.043 0.430 0.025 0.018 For an ideal solution, the entropy of mixing ( S mix ) and the Gibbs free energy of mixing ( G mix ) are respectively: Positive, Negative Positive, Positive Zero, Negative Negative, Negative Calculate the molality of H 2SO 4 in a solution containing 98 % ,H 2SO 4 by mass. 500 ,m 98 ,m 10 ,m 1 ,m What is the mole fraction of benzene in a solution containing 30 % by mass in carbon tetrachloride? 0.459 0.300 0.541 0.150 What is the normality of a 1 ,M H 3PO 4 solution for a reaction where it is converted to Na 2HPO 4 ? 2 ,N 1 ,N 3 ,N 1.5 ,N What is the mole fraction of a solute in its 2.0 ,m aqueous solution? 0.0347 0.0177 0.0360 0.0400 The molarity of a 10 % ,(w/v) H 2SO 4 solution is approximately: 1.02 M 0.10 M 1.84 M 0.50 M The molarity of a solution obtained by mixing 750 mL of 0.5 M HCl with 250 mL of 2 M HCl will be: 0.875 M 1.00 M 1.75 M 0.975 M A solution of CaCl 2 is 0.5 M . What will be its Normality? 1.0 N 0.5 N 0.25 N 2.0 N Calculate the molality of Cl - ions in a solution containing 11.1 g of CaCl 2 in 500 g of water. (Atomic mass: Ca=40, Cl=35.5 ) 0.4 m 0.2 m 0.1 m 0.5 m If 6.02 10 20 molecules of urea are present in 100 ,mL of its solution, the concentration of the solution is: 0.01 M 0.001 M 0.1 M 0.02 M Which of the following phosphorus acids is monobasic, and what would be its normality if the solution is 0.5 ,M ? H 3PO 2 , 0.5 N H 3PO 3 , 1.0 N H 3PO 4 , 1.5 N H 3PO 2 , 1.0 N What is the mole fraction of ethanol in an aqueous solution which is 46 % ethanol by mass? 0.25 0.46 0.50 0.75 What is the mole fraction of the solute in a 20 % (by mass) aqueous solution of glucose ( C 6H 12 O 6 )? 0.024 0.050 0.111 0.200 What is the mole fraction of the solute in a 1.0 ,m non-aqueous solution where the solvent is ethanol ( C 2H 5OH )? 0.044 0.017 0.180 0.052 In a substituted solid solution, the solute atoms: Occupy lattice sites normally occupied by solvent atoms Occupy the interstitial spaces of the solvent lattice Form a separate phase within the solvent Are always larger than the solvent atoms The molality of a 10 % ,(w/w) aqueous solution of glucose ( C 6H 12 O 6 ) is: 0.617 m 0.555 m 1.11 m 0.10 m A solution of urea is 10 % by mass. The mole fraction of urea in the solution is (Molar mass of urea = 60 ,g/mol ): 0.032 0.100 0.016 0.054 A solution containing 10 g per dm 3 of urea (molecular mass = 60 g mol -1 ) is isotonic with a 5% solution of a nonvolatile solute. The molecular mass of this nonvolatile solution is: 250 g mol -1 300 g mol -1 350 g mol -1 200 g mol -1 Molality is preferred over molarity in reporting concentration because: It does not change with temperature as it is based on mass It is easier to calculate It is always a larger numerical value It accounts for the volume of the solute Concentrated aqueous sulphuric acid is 98% H2SO4 by mass and has a density of 1.80 g mL -1 . Volume of acid required to make one litre of the 0.1M H2SO4 solution is 16.65 mL 22.20mL 5.55 mL 11.10mL Identify the correct statements : (A) The molality of 2.5 g of ethanoic acid (Molar mass : 60 g mol -1 ) in 75 g of benzene solution is 0.556 m. (B) The molarity of a solution containing 5 g of NaOH (molar mass : 40 g mol -1 ) in 450 mL of solution is 0.278 M at 298 K. (C) Aquatic species are more comfortable in cold water. (D) The solubility of gas increases with decrease in pressure. (E) For a binary mixture of A and B, the number of moles of A and B are n A and n B respectively. The mole fraction of B will be x B = n A n A +n B . Choose the correct answer from the options given below : A, B and C only A, D and E only A and B only A and C only If a sample of drinking water is found to be severely contaminated with chloroform, supposed to be carcinogen, at a level of 15 ,ppm (by mass). What is the molality of chloroform ( CHCl 3 ) in the water? 1.25 10 -4 ,m 1.25 10 -5 ,m 15 10 -6 ,m 0.15 ,m What is the mole fraction of water in a 20 % (w/w) aqueous solution of glucose ( C 6H 12 O 6 )? 0.975 0.025 0.800 0.200 The mole fraction of a solute in an aqueous solution is 0.1 . What is the molality of the solution? 6.17 m 5.55 m 1.11 m 0.10 m The molarity of a 2.0 m aqueous solution of NaOH (density = 1.2 g/mL ) is: 2.22 M 2.00 M 1.85 M 2.40 M A solution of Na 2SO 4 in water is 1.0 ,molal . The mole fraction of Na 2SO 4 is: 0.0177 0.0354 0.0500 0.100 In the process of desalination of seawater using reverse osmosis, the semi-permeable membrane is usually made of: Cellulose acetate Steel mesh Animal bladder Parchment paper The solubility of a solid solute in a liquid solvent is generally: Independent of pressure Directly proportional to pressure Inversely proportional to pressure Independent of temperature Brass is an example of which type of solution? Solid in solid Liquid in solid Gas in solid Solid in liquid