Tiêu đề 15.SOLUTIONS.pdf ✅

UNIT 01 SOLUTIONS Exercise 1: NCERT Based Topic-wise MCQs 1.0 INTRODUCTION 1. Vapour pressure, colligative properties are the properties of NCERT/Page-35 / N-15 (a) Gas (b) Solution (c) Mixture (d) Solid 1.1 TYPES OF SOLUTIONS 2*. The term homogenous mixtures signifies that NCERT/ Page-35 / N-1 (a) its composition is uniform throughout the mixture. (b) its properties are uniform throughout the mixture. (c) both composition and properties are uniform throughout the mixture. (d) neither composition nor properties are uniform throughout the mixture. 1.2 EXPRESSING CONCENTRATION OF SOLUTIONS 3. Molarity of liquid HCl will be, if density of solution is 1.17g/cc (a) 36.5 (b) 32.05 (c) 18.25 (d) 42.10 4. 1M, 2.5 litre NaOH solution is mixed with another 0.5M, 3 litre NaOH solution. Then find out the molarity of resultant solution (a) 0.80M (b) 1.0M (c) 0.73M (d) 0.50M 5. An aqueous solution of glucose is 10% in strength. The volume in which 1g mole of it is dissolved, will be (a) 9 litre (b) 1.8 litre (c) 8 litre (d) 0.9 litre 6*. 10g of NaCl is dissolved in 106g of the solution. Its concentration is (a) 100ppm
(b) 0.1ppm (c) 1ppm (d) 10ppm 7. 2.5 litres of NaCl solution contain 5 moles of the solute. What is the molarity? (a) 5 molar (b) 2 molar (c) 2.5molar (d) 12.5 molar 8. 5mL of NHCl, 20mL of N/2H2SO4 and 30mL of N/3HNO3 are mixed together and volume made to one litre. The normality of the resulting solution is (a) N 5 (b) N 10 (c) N 20 (d) N 40 9. What is the normality of a 1M solution of H3PO4 ? (a) 0.5N (b) 1.0N (c) 2.0N (d) 3.0N 10. 200ml of water is added to 500ml of 0.2M solution. What is the molarity of this diluted solution? (a) 0.5010M (b) 0.2897M (c) 0.7093M (d) 0.1428M 11. For preparing 0.1N solution of a compound from its impure sample of which the percentage purity is known, the weight of the substance required will be (a) Less than the theoretical weight (b) More than the theoretical weight (c) Same as the theoretical weight (d) None of these 12. For mixture containing "four" components which of the following is correct in term of mole fraction? (a) x1 + x2 + x3 + x4 ≠ 1 NCERT Page-37 / N-3 (b) n3 n1+n2+n3 = x1 (c) x1 = n1 n1+n2+n3+n4 = n1 Σn (d) n1 + n2 + n3 + n4 = 1 13. Which of the following statements, regarding the mole fraction (x) of a component in solution, is incorrect? NCERT Page-37 / N-3 (a) 0 ≤ x ≤ 1 (b) x < 1 (c) x is always non-negative (d) None of these
14. An X molal solution of a compound in benzene has mole fraction of solute equal to 0.2 . The value of X is (a) 14 (b) 3.2 (c) 1.4 (d) 2 15. 25mL of a solution of barium hydroxide on titration with a 0.1 molar solution of hydrochloric acid gave a titre value of 35mL. The molarity of barium hydroxide solution was (a) 0.07 (b) 0.14 (c) 0.28 (d) 0.35 16. The volume of 4NHCl and 10NHCl required to make 1 litre of 6NHCl are (a) 0.75 litre of 10NHCl and 0.25 litre of 4NHCl (b) 0.50 litre of 4NHCl and 0.50 litre of 10NHCl (c) 0.67 litre of 4NHCl and 0.33 litre of 10NHCl (d) 0.80 litre of 4NHCl and 0.20 litre of 10NHCl 17. Molarity of H2SO4 is 18M. Its density is 1.8g/ml. Hence molality is (a) 36 (b) 200 (c) 500 (d) 18 18. How many grams of concentrated nitric acid solution should be used to prepare 250mL of 2.0MHNO3 ? The concentrated acid is 70%HNO3 (a) 90.0g conc. HNO3 (b) 70.0g conc. HNO3 (c) 54.0g conc. HNO3 (d) 45.0g conc. HNO3 19. If N 10 50mLH2SO4, N 3 30mLHNO3, N 2 10mLHCl is mixed and solution is made to 1L. Then normality of resultant solution is (a) N 20 (b) N 40 (c) N 50 (d) N 20. A solution is prepared by dissolving 10gNaOH in 1250 mL of a solvent of density 0.8mL/g. The molality of the solution in molkg−1 is (a) 0.25 (b) 0.2 (c) 0.008 (d) 0.0064 21. When 800mL of 0.5M nitric acid is heated in a beaker, its volume is reduced to half and 11.5g of nitric acid is evaporated. The molarity of the remaining nitric acid solution is x × 10−2 M. x is : NCERT Page-38 / N - 4 (a) 54
(b) 0.04 (c) 108 (d) 95 1.3 SOLUBILITY 22. At the state of dynamic equilibrium, for solute + solvent ⇋ solution. NCERT Page-40 / N - 6 (a) Rate of dissolution = Rate of unsaturation. (b) Rate of dissolution = Rate of unsaturation. (c) Rate of dissolution = Rate of saturation (d) Rate of crystallization = Rate of saturation. 23. Which of the following statements is incorrect? NCERT Page-40 / N-6 (a) A solution in which no more solute can be dissolved at the same temperature and pressure is called a saturated solution. (b) An unsaturated solution is one in which more solute can be dissolved at the same temperature. (c) The solution which is in dynamic equilibrium with undissolved solute is the saturated solution. (d) The minimum amount of solute dissolved in a given amount of solvent is its solubility. 24. The statement "If 0.003 moles of a gas are dissolved in 900g of water under a pressure of 1 atmosphere, 0.006 moles will be dissolved under a pressure of 2 atmospheres", illustrates (a) Dalton's law of partial pressure NCERTPage-41/N-7 (b) Graham's law (c) Raoult's law (d) Henry's law 25. For a solution of the gases A, B, C and D in water at 298K, the values of Henry's law constant (KH) are 30.40, 2.34, 1.56 × 10−5 and 0.513k bar respectively. In the given graph, the lines marked as ' p ' and ' s ' correspond respectively to: NCERT Page-41 / N-7 (a) A and C (b) B and A (c) D and A (d) C and D 26. People living at high attitudes often reported with a problem of feeling weak and inability to think clearly. The reason for this is. NCERT/Page-43 / N-9 (a) at high altitudes the partial pressure of oxygen is less than at the ground level. (b) at high altitudes the partial pressure of oxygen is more than at the ground level.