Solutions MHT-CET pyq's

 MHT-CET 2004

1. The freezing point of a 0.05 molal solution of a non -electrolyte in water is 

• (A) -0.093°C        
• (B) 1.86°C         
• (C) 0.93°C        
• (D) 0.093°C

MHT-CET 2006

2. What is the amount of urea dissolved per litre, if aqueous solution is isotonic with 10% cane sugar solution (mo. wt. of urea = 60)?

• (A) 200 g/L        
• (B) 19.2 g/L        
• (C) 17.54 g/L        
• (D) 16.7 g/L 

MHT-CET 2007

3. Which of the following is not a colligative property?

• (A) Elevation in boding point    
• (B) Lowering of vapour pressure     
• (C) Osmotic pressure     
• (D) Freezing point

MHT-CET 2008

4. Maximum depression in freezing point is caused by 

• (A) potassium chloride     
• (B) sodium sulphate     
• (C) magnesium sulphate     
• (D) magnesium carbonate

 

MHT-CET 2010 

5. Dissolution of 1.5 g of a non-volatile solute (moI. wt. = 60) in 250 g of a solvent reduces its freezing point by 0.01°Cd. Find the molal depression constant of the solvent.

• (A)  0.01     
• (B) 0.001     
• (C) 0.0001    
• (D) 0.1

MHT-CET 2015

6. If M. W and V represent molar mass of solute, mass of solute and volume of solution in litres respectively, which among following equations is true'?

• (A) π = MWR/TV        
• (B) π = TMR/WV     
• (C) π = TWR/VM    
• (D) π =TRV/WM

7. van't Hoff factor of centimolal solution of  K3[Fe(CN)6] is 3.333. Calculate the pecent dissociation of K3(Fe(CN)6)

• (A) 33.33         
• (B) 0.78        
• (C) 78        
• (D) 23.33

MHT-CET 2016

8. Identify the compound amongst the following of which 0.1 M aqueous solution has highest boiling point. 

• (A) Glucose     
• (B) Sodium chloride     
• (C) Calcium chloride     
• (D) Ferric chloride

9. The relation between solubility of a gas in liquid at constant temperature and external pressure is stated by which law?

• (A) Raoult's law     
• (B) van't Hoff Boyle's' law     
• (C) van't Hoff Charles' law    
• (D) Henry's law

MHT-CET 2017
 

10. Solubility of which among the following solids in water changes slightly with temperature? 

• (A) KNO3          
• (B) NaNO3        
• (C) KBr        
• (D) NaBr 

11. The osmotic pressure of solution containing 34.2 g of cane sugar (molar mass = 342 g mol^-1) in 1L of solution at 20°C is (Given, R = 0.082 L atm K^-1 mol^-1)

• (A) 2.40 atm        
• (B) 3.6 atm         
• (C) 24 atm        
• (D) 0.0024 atm

12. For which among the following equimolar aqueous solutions van't Hoff factor has the lowest value?

• (A) Aluminium chloride    
• (B) Potassium sulphate    
• (C) Ammonium chloride    
• (D) Urea
  

MHT-CET 2018 

13. The correct relation between elevation of boiling point and molar mass of solute is

• (A) M2 = Kb .W2/△Tb.W1        
• (B) M2 = Kb.W1/△Tb.W2    
• (C) M2 = △Tb.Kb/W1.W2    
• (D) M2 = △Tb.W1/Kb.W2

 MHT-CET 2019 

14. Calculate van't Hoff factor for 0.2 m aqueous solution of KCl which freezes at -0.680°C. (Kf = 1.86 K kg mol^-1)

• (A) 1.86        
• (B) 6.8         
• (C) 3.72        
• (D) 1.83

15. 'KH' is Henry's constant and has the unit 

• (A) atm mol dm^-3     
• (B) mol dm^-3 atm^-1    
• (C) mol^-1dm³    
• (D) mol^-1dm³atm^-1

16. Which of the following sets of components form homogeneous mixture? 

• (A) Silver chloride + Water     
• (B) Sugar + Benzene     
• (C) Ethyl alcohol + Water     
• (D) Phenol + Water

17. If the van't Hoff factor for 0.1M Ba(NO3)2 solution is 2.74, the degree of dissociation is 

• (A) 0.91     
• (B) 0.87     
• (C) 0.74     
• (D) 87 

18. 9 gram anhydrous oxalic acid (Mol. Wt = 90) was dissolved in 9.9 moles of water. If vapour pressure of pure water is P1° , the vapour pressure of solution is 

• (A) 1.1P1°     
• (B) 0.99P1°     
• (C) 0.90P1°     
• (D) 0.1P1°

19. Which of the following sets of solutions of urea (mol. mass. 60 g mol^-1) and sucrose (mol. mass. 342 g mol) is isotonic ?

• (A) 3.0 gL^-1 urea and 17.1 gL^-1 sucrose     
• (B) 3.0 gL^-1 urea and 3.0 gL^-1 sucrose                      
• (C) 9.1 gL^-1 urea and 6.0 gL^-1 sucrose       
• (D) 6.0 gL^-1 urea and 9.0 gL^-1 sucrose 

20. Relationship between vant Hoff factor (i) and degree of dissociation (α) is

• (A) α = (1 - i)/(n - 1)        
• (B) i = - (α - 1)/(1- n)         
• (C) i = (α - 1)/(n - 1)         
• (D) α = (i - 1)/(n - 1)

21. 18 gram glucose (Molar mass = 180) is dissolved in 100 ml of water at 300 K. If R = 0.0821 L-atm mol^-1K^-1, what is the osmotic pressure of solution? 

• (A) 2.463 atm        
• (B) 8.21 atm         
• (C) 24.63 atm         
• (D) 0.821 atm

22. The elevation in boiling point of 0.25 molal aqueous solution of a substance is (Kb = 0.52 K kg mol^-1) 

• (A) 0.13 K         
• (B) 2.08 K      
• (C) 0.50 K        
• (D) 0.15  K

23. Relation between depression of freezing point and molar mass of the solute is 

• (A) △Tf = M2.W1/Kf.W2        
• (B) M2 = Kf.W1/△Tf.W2        
• (C) △Tf = Kf.W2/M2.W1      
• (D) △Tf.W2/Kf.W1

24. Identify the colligative property among the followings. 

• (A) Boiling point of a solvent     
• (B) Vapour pressure of a solvent     
• (C) Freezing point of a solvent    
• (D) Osmotic pressure of a solution 

25. What is the mass of sucrose in its 1L solution which is isotonic with 6.6 g L^-1 of urea? (Atomic mass: H = 1, C =12, N = 14, o =16

• (A) 37.62 g      
• (B) 30.1 g    
• (C) 68.2 g     
• (D) 34.2 g

26. Which of the following solutes has highest △Tf/m value in its 0.05 molal aqueous solution? 

• (A) Potassium sulphate     
• (B) Glucose
• (C) Ammonium chloride     
• (D) Aluminium chloride

MHT-CET 2020

27. Which of the following statement is NOT correct about solution?

• (A) True solution is a heterogenous mixture of two or more substances with fixed composition                                               
• (B) The three states of matter solid, liquid and gas may play the role of either solute or solvent
• (C) The component of solution which constitute smaller part is called solute                             
• (D) When water is solvent, the process of salvation is known as hydration 

28. Which of the following changes will cause increase in vapour pressure of 1 molal aqueous KJ solution at same temperature? 

• (A) addition of 0.1 molal solution of  NaCl
• (B) addition of 1 molal KI solution
• (C) addition of water
• (D) addition of 0.5 molal solution of  Na2SO4

29. Which of the following pairs of solution is isotonic?                                                                     (Molar mass : urea = 60, sucrose = 342 g mol^-1)         

• (A) 0.3 gL^-1 urea and 17.19 gL^-1 sucrose
• (B) 3.0 gL^-1 urea and 17.19 gL^-1 sucrose 
• (C) 3.0 gL^-1 urea and 1.719 gL^-1 sucrose                     
• (D) 30 gL^-1 urea and 17.19gL^-1 sucrose 

30. According to Raoult's law, relative lowering of vapour pressure for a solution containing a non-volatile solute is equal to

• (A) moles of solute
• (B) mole fraction of solute 
• (C) moles of solvent
• (D) mole fraction of solvent

31. The Henry's law constant for oxygen is 1.3 x 10^-3 mol dm^-3 atm^-1. If partial pressure of oxygen is 0.46 atmosphere, what is the concentration of dissolved oxygen at 25°C and 1 atm pressure     

• (A) 2.82 x 10^-3 mol dm^-3
• (B) 5.98 x 10^-4 mol dm^-3
• (C) 3.53 x 10^-4 mol dm^-3
• (D) 5.98 mol dm^-3                                                    

32. 38.4 g of unknown substance (molar mass 384 g mol^-1) and 116 g of acetone is used to prepare a solution at 313 K. If vapour pressure of pure acetone (molar mass 58 g mol^-1) is 0.842 atmosphere, what is the vapour pressure of solution? 

• (A) 0.7999 atm
• (B) 0.880 atm
• (C) 0.650 atm
• (D) 0.958 atm

33. 0.5 molal aqueous solution of a weak acid (HX) is 20% Ionized. If Kf of water is 1.86 K kg mo1^-1, the lowering in freezing point of solution is

• (A) 0.56 K
• (B) 1.12 K
• (C) -1.12 K
• (D) -0.56 K 

34. Osmotic pressure of one molar solution at 27°C is (R = 0.082)

• (A) 12.1 atm
• (B) 1.21 atm
• (C) 2.46 atm
• (D) 24.6 atm

35. Which among following is true for the value of Henry's law constant K? 

• (A) is same for all gasses
• (B) is greater for gases with higher solubilities
• (C) increases with increase in temperature
• (D) first increases and then decreases with increase in temperature                                                          

36. Vapour pressure of solvent 'A' is 0.90 atm, when a non-volatile solute is added, vapor pressure drops to 0.60 atm. What is mole fraction of A in solution? 

• (A) 0.500
• (B) 0.667
• (C) 0.300
• (D) 0.333 

37. What is the value of Kf if 30 g urea (molar mass 60) dissolved in 0.5 dm³ of water decreases the freezing point by 0.15 K?

• (A) 0.30 K kg mol^-1
• (B) 0.030 K kg mol^-1
• (C) 0.15 K kg mol^-1
• (D) 0.015 K kg mol^-1

38. An amalgam of mercury with sodium is an example of 

• (A) liquid in liquid solution
• (B) solid in liquid solution
• (C) solid in solid solution
• (D) liquid in solid solution

39. Solution of chloroform in nitrogen is an example of

• (A) liquid in solid
• (B) liquid in gas
• (C) gas in liquid
• (D) liquid in liquid 

40. Which of following 0.1 m aqueous solution exhibits highest osmotic pressure at 25°C?

• (A) urea
• (B) CoC12
• (C) glucose
• (D) KC1 

41. Identify the correct relation between depression in freezing point and freezing point of pure solvent. 

• (A) T° = T - △Tf 
• (B) T° = △Tf - T 
• (C) T° = △Tf + T 
• (D) T° = T x △Tf 

42. If a centimolal aqueous solution of K3[Fe(CN)6] has degree of dissociation 0.78, what is the value of van't Hoff factor?

• (A) 3.34
• (B) 2.5
• (C) 1.2
• (D) 4.0

43. What is osmotic pressure of a semi molar solution at 27°C? (R = 0.082)

• (A) 4.96 atm
• (B) 2.46 atm
• (C) 12.3 atm
• (D) 20.5 atm 

44. Solutions A, B, C and D are respectively 0.2 M urea, 0.10 M NaCI, 0.05 M BaC12 and 0.05 M AlC13. All solutions are isotonic with each other except

• (A) C
• (B) D
• (C) A
• (D) B

45. Henry's law is a relation between 

• (A) temperature and pressure
• (B) pressure and solubility
• (C) pressure and volume
• (D) volume and solubility

46. Relative lowering in vapour pressure of a solution containing non-volatile solute is the ratio of 

• (A) number of moles of solute to total number of moles of solution
• (B) number of moles of solvent to number of moles of solute
• (C) number of moles of solvent to total number of moles of solution
• (D) number of moles of solute to number of moles of solvent

47. Solution of 'A' containing 3.42 g of it in 100 cm³ of water is found to be isotonic with a 6.84% (w/V) solution of sucrose, what is the molar mass of 'A'? (At. wt: C = 12, H = 1, O =16)

• (A) 68
• (B) 180
• (C) 171
• (D) 342 

48. Which of the following solution will have highest freezing point depression?

• (A) 1 M sucrose
• (B) 1 M KCl
• (C) 1 M glucose
• (D) 1 M urea 

49. van't Hoff factor (i) for centimolal solution of K3[Fe(CN)6] is 3.333. What is it's percentage depression?

• (A) 70% 
• (B) 33.33%
• (C) 80%
• (D) 77.7%

50. A 5 % solution of cane sugar (molar mass 342) is isotonic with 1 % solution of non-electrolye substance X, the molar mass of substance X is 

• (A) 34.2 g mol^-1
• (B) 171.2 g mol^-1
• (C) 136.8 g mol^-1
• (D) 68.4 g mol^-1

51. Identify the correct statement from the following:

• (A) Vapour pressure of a solution containing a non-volatile solute is always less than the vapour pressure of the pure solvent.
• (B) Boiling point of pure solvent is always greater than the boiling point of its solution containing a non-volatile solute.
• (C) Liquids having greater intermolecular forces have lower boiling points.
• (D) Vapour pressure of a solution containing a non-volatile solute is always greater than the vapour pressure of the pure solvent.

52. What is the value of Kf if 6g of urea is dissolved in 0.1 dm³ of water?                                                 (△Tf = 0.15° C and molar mass of urea = 60)

• (A) 0.030 K kg mol^-1
• (B) 0.15 K kg mol^-1
• (C) 0.015 K kg mol^-1
• (D) 0.30 K kg mo1^-1

53. Which of the following equation is correct to determine osmotic pressure using van't Hoff equation? 

• (A)  πV = w2.R.T/M2
• (B) πC = VRT
• (C) π = w2.R.T/M2
• (D) πV = k

54. 30 x 10^-4 kg urea dissolved in water to make 500 mL aqueous solution and it is isotonic with cane sugar solution. What quantity of cane sugar is present in it's 1 lit. solution?                                            (At mass: H = 1, N = 14, O = 16, C = 12) 

• (A) 171 g
• (B) 17.1 g
• (C) 3.42 g
• (D) 34.2 g

55. What is the freezing point of a solution containing 1.8 g glucose dissolved in 1000 g of water?             (Kf of water = 1.86 K kg mo1^-1 and at. mass C = 12, H = 1, O = 16)     

• (A) -0.0093°C
• (B) -0.0372°C
• (C) -0.0186°C
• (D) 0.0186°C 

56. If 10 g each of glucose, urea and sucrose is dissolved in 250 mL of water having osmotic pressure π1, π2 and π3) respectively, the decreasing order of osmotic pressure of these solutions is     

• (A) π1 > π2  > π3
• (B) π2 > π1 > π3
• (C) π2 > π3 > π1
• (D) π3 > π1 > π2