Quiz - chemistry - Solutions-PYQ

Q1. Which of the following is dependent on temperature? Source: orcusprep.in

NEET 2017

easy

Molarity

Mole fraction

Weight percentage

Molality

Q2. What is the mole fraction of the solute in a 1.00 m aqueous solution? Source: orcusprep.in

NEET 2015, 2011

easy

1.770

0.0354

0.0177

0.177

Q3. How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M $ HNO_{3} $? The concentrated acid is 70% $ HNO_{3} $. Source: orcusprep.in

NEET 2013

medium

70.0 g conc. $ HNO_{3} $

54.0 g conc. $ HNO_{3} $

45.0 g conc. $ HNO_{3} $

90.0 g conc. $ HNO_{3} $

Q4. Which of the following compounds can be used as antifreeze in automobile radiators? Source: orcusprep.in

NEET 2012

easy

Methyl alcohol

Glycol

Nitrophenol

Ethyl alcohol

Q5. Concentrated aqueous sulphuric acid is 98% $ H_{2}SO_{4} $ by mass and has a density of 1.80 g $ mL^{-1} $. Volume of acid required to make one litre of 0.1 M $ H_{2}SO_{4} $ solution is Source: orcusprep.in

NEET 2007

medium

16.65 mL

22.20 mL

5.55 mL

11.10 mL

Q6. The mole fraction of the solute in one molal aqueous solution is Source: orcusprep.in

NEET 2005

easy

0.009

0.018

0.027

0.036

Q7. 2.5 litre of 1 M NaOH solution is mixed with another 3 litre of 0.5 M NaOH solution. Then find out molarity of resultant solution. Source: orcusprep.in

NEET 2002

easy

0.80 M

1.0 M

0.73 M

0.50 M

Q8. How many g of dibasic acid (mol. weight 200) should be present in 100 mL of the aqueous solution to give strength of 0.1 N? Source: orcusprep.in

NEET 1999

medium

10 g

2 g

1 g

20 g

Q9. What is the molarity of $ H_{2}SO_{4} $ solution, that has a density 1.84 g/cc at 35$ ° $C and contains 98% by weight? Source: orcusprep.in

NEET 1996

easy

18.4 M

18 M

4.18 M

8.14 M

Q10. The concentration unit, independent of temperature, would be Source: orcusprep.in

NEET 1995, 1992

easy

normality

weight volume percent

molality

molarity.

Q11. How many grams of $ CH_{3}OH $ should be added to water to prepare 150 mL solution of 2 M $ CH_{3}OH $? Source: orcusprep.in

NEET 1994

easy

$ 9.6 \times 10^{3} $

$ 2.4 \times 10^{3} $

9.6

2.4

Q12. In water saturated air, the mole fraction of water vapour is 0.02. If the total pressure of the saturated air is 1.2 atm, the partial pressure of dry air is Source: orcusprep.in

NEET 2019

easy

1.18 atm

1.76 atm

1.176 atm

0.98 atm.

Q13. $ p_{A} $ and $ p_{B} $ are the vapour pressures of pure liquid components, A and B, respectively of an ideal binary solution. If $ x_{A} $ represents the mole fraction of component A, the total pressure of the solution will be Source: orcusprep.in

NEET 2012

medium

$ p_{A} + x_{A}(p_{B} - p_{A}) $

$ p_{A} + x_{A} (p_{A} - p_{B}) $

$ p_{B} + x_{A}(p_{B} - p_{A}) $

$ p_{B} + x_{A} (p_{A} - p_{B}) $

Q14. Vapour pressure of chloroform ($ CHCl_{3} $) and dichloromethane ($ CH_{2}Cl_{2} $) at 25°C are 200 mm Hg and 415 mm Hg respectively. Vapour pressure of the solution obtained by mixing 25.5 g of $ CHCl_{3} $ and 40 g of $ CH_{2}Cl_{2} $ at the same temperature will be (Molecular mass of $ CHCl_{3} $ = 119.5 u and molecular mass of $ CH_{2}Cl_{2} $ = 85 u) Source: orcusprep.in

Mains NEET 2012

medium

173.9 mm Hg

615.0 mm Hg

347.9 mm Hg

285.5 mm Hg

Q15. A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressures of the pure hydrocarbons at 20 $ ° $C are 440 mm Hg for pentane and 120 mm Hg for hexane. The mole fraction of pentane in the vapour phase would be Source: orcusprep.in

NEET 2005

medium

0.200

0.549

0.786

0.478

Q16. The vapour pressure of two liquids P and Q are 80 and 60 torr, respectively. The total vapour pressure of solution obtained by mixing 3 mole of P and 2 mol of Q would be Source: orcusprep.in

NEET 2005

easy

72 torr

140 torr

68 torr

20 torr

Q17. The mixture which shows positive deviation from Raoult’s law is Source: orcusprep.in

NEET 2020

easy

ethanol + acetone

benzene + toluene

acetone + chloroform

chloroethane + bromoethane.

Q18. For an ideal solution, the correct option is Source: orcusprep.in

NEET 2019

easy

$ \Delta_{\text{mix}} G = 0 $ at constant T and P

$ \Delta_{\text{mix}} S = 0 $ at constant T and P

$ \Delta_{\text{mix}} V \neq 0 $ at constant T and P

$ \Delta_{\text{mix}} H = 0 $ at constant T and P.

Q19. The mixture that forms maximum boiling azeotrope is Source: orcusprep.in

NEET 2019

medium

heptane + octane

water + nitric acid

ethanol + water

acetone + carbon disulphide.

Q20. Which of the following statements is correct regarding a solution of two components A and B exhibiting positive deviation from ideal behaviour? Source: orcusprep.in

NEET 2019

easy

Intermolecular attractive forces between A-A and B-B are stronger than those between A-B.

$ \Delta_{\text{mix}} H = 0 $ at constant T and P.

$ \Delta_{\text{mix}} V = 0 $ at constant T and P.

Intermolecular attractive forces between A-A and B-B are equal to those between A-B.

Q21. Which one of the following is incorrect for ideal solution? Source: orcusprep.in

NEET-II 2016

medium

$ \Delta_{\text{mix}} H = 0 $

$ \Delta_{\text{mix}} U = 0 $

$ \Delta P = P_{\text{obs}} - P_{\text{calculated by Raoult’s law}} = 0 $

$ \Delta_{\text{mix}} G = 0 $

Q22. Which of the following statements about the composition of the vapour over an ideal 1 : 1 molar mixture of benzene and toluene is correct? Assume that the temperature is constant at 25°C. (Given, vapour pressure data at 25°C, benzene = 12.8 kPa, toluene = 3.85 kPa) Source: orcusprep.in

NEET-I 2016

medium

The vapour will contain equal amounts of benzene and toluene.

Not enough information is given to make a prediction.

The vapour will contain a higher percentage of benzene.

The vapour will contain a higher percentage of toluene.

Q23. Which condition is not satisfied by an ideal solution? Source: orcusprep.in

Karnataka NEET 2013

easy

$ \Delta_{\text{mix}} V = 0 $

$ \Delta_{\text{mix}} S = 0 $

Obeyance to Raoult’s Law

$ \Delta_{\text{mix}} H = 0 $

Q24. A solution of acetone in ethanol Source: orcusprep.in

NEET 2006

easy

obeys Raoult’s law

shows a negative deviation from Raoult’s law

shows a positive deviation from Raoult’s law

behaves like a near ideal solution.

Q25. A solution containing components A and B follows Raoult’s law Source: orcusprep.in

NEET 2002

easy

A - B attraction force is greater than A - A and B - B

A - B attraction force is less than A - A and B - B

A - B attraction force remains same as A - A and B - B

volume of solution is different from sum of volume of solute and solvent.

Q26. All form ideal solution except Source: orcusprep.in

NEET 1988

easy

$ C_{6}H_{6} $ and $ C_{6}H_{5}CH_{3} $

$ C_{2}H_{5}Br $ and $ C_{2}H_{5}I $

$ C_{6}H_{5}Cl $ and $ C_{6}H_{5}Br $

$ C_{2}H_{5}I $ and $ C_{2}H_{5}OH $

Q27. An ideal solution is formed when its components Source: orcusprep.in

NEET 1988

easy

have no volume change on mixing

have no enthalpy change on mixing

have both the above characteristics

have high solubility.

Q28. The freezing point depression constant ($ K_{f} $) of benzene is 5.12 K kg mol–1. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is (rounded off upto two decimal places) Source: orcusprep.in

NEET 2020

easy

0.20 K

0.80 K

0.40 K

0.60 K

Q29. If molality of the dilute solution is doubled, the value of molal depression constant ($ K_{f} $) will be Source: orcusprep.in

NEET 2017

easy

halved

tripled

unchanged

doubled.

Q30. At 100$ ° $C the vapour pressure of a solution of 6.5 g of a solute in 100 g water is 732 mm. If $ K_{b} $ = 0.52, the boiling point of this solution will be Source: orcusprep.in

NEET-I 2016

hard

102 $ ° $C

103 $ ° $C

101 $ ° $C

100 $ ° $C

Q31. 200 mL of an aqueous solution of a protein contains its 1.26 g. The osmotic pressure of this solution at 300 K is found to be 2.57 $ \times 10^{-3} $ bar. The molar mass of protein will be (R = 0.083 L bar $ mol^{-1} K^{-1} $) Source: orcusprep.in

Mains NEET 2011

medium

51022 g $ mol^{-1} $

122044 g $ mol^{-1} $

31011 g $ mol^{-1} $

61038 g $ mol^{-1} $

Q32. A solution of sucrose (molar mass = 342 g $ mol^{-1} $) has been prepared by dissolving 68.5 g of sucrose in 1000 g of water. The freezing point of the solution obtained will be ($ K_{f} $ for water = 1.86 K kg $ mol^{-1} $) Source: orcusprep.in

NEET 2010

easy

– 0.372 $ ° $C

– 0.520 $ ° $C

+ 0.372 $ ° $C

– 0.570 $ ° $C

Q33. During osmosis, flow of water through a semipermeable membrane is Source: orcusprep.in

NEET 2006

easy

from solution having lower concentration only

from solution having higher concentration only

from both sides of semipermeable membrane with equal flow rates

from both sides of semipermeable membrane with unequal flow rates.

Q34. 1.00 g of a non-electrolyte solute (molar mass 250 g $ mol^{-1} $) was dissolved in 51.2 g of benzene. If the freezing point constant, $ K_{f} $ of benzene is 5.12 K kg $ mol^{-1} $, the freezing point of benzene will be lowered by Source: orcusprep.in

NEET 2006

easy

0.2 K

0.4 K

0.3 K

0.5 K

Q35. A solution containing 10 g per $ dm^{3} $ of urea (molecular mass = 60 g $ mol^{-1} $) is isotonic with a 5% solution of a non-volatile solute. The molecular mass of this non-volatile solute is Source: orcusprep.in

NEET 2006

medium

200 g $ mol^{-1} $

250 g $ mol^{-1} $

300 g $ mol^{-1} $

350 g $ mol^{-1} $

Q36. A solution of urea (mol. mass 56 g $ mol^{-1} $) boils at 100.18$ ° $C at the atmospheric pressure. If $ K_{f} $ and $ K_{b} $ for water are 1.86 and 0.512 K kg $ mol^{-1} $ respectively, the above solution will freeze at Source: orcusprep.in

NEET 2005

medium

0.654$ ° $C

– 0.654$ ° $C

6.54$ ° $C

– 6.54$ ° $C

Q37. A solution contains non-volatile solute of molecular mass $ M_{2} $. Which of the following can be used to calculate the molecular mass of solute in terms of osmotic pressure? Source: orcusprep.in

NEET 2002

easy

$$ M_{2} = \frac{m_{2} \pi}{VRT} $$

$$ M_{2} = \frac{m_{2}VRT}{\pi} $$

$$ M_{2} = \frac{\pi V}{m_{2}RT} $$

$$ M_{2} = \frac{m_{2}RT}{\pi V} $$

Q38. Pure water can be obtained from sea water by Source: orcusprep.in

NEET 2001

easy

centrifugation

plasmolysis

reverse osmosis

sedimentation.

Q39. From the colligative properties of solution, which one is the best method for the determination of molecular weight of proteins and polymers? Source: orcusprep.in

NEET 2000

easy

Osmotic pressure

Lowering in vapour pressure

Lowering in freezing point

Elevation in boiling point

Q40. The vapour pressure of benzene at a certain temperature is 640 mm of Hg. A non-volatile and non-electrolyte solid, weighing 2.175 g is added to 39.08 of benzene. The vapour pressure of the solution is 600 mm of Hg. What is the molecular weight of solid substance? Source: orcusprep.in

NEET 1999

hard

69.5

59.6

49.50

79.8

Q41. If 0.15 g of a solute, dissolved in 15 g of solvent, is boiled at a temperature higher by 0.216$ ° $C, than that of the pure solvent. The molecular weight of the substance (Molal elevation constant for the solvent is 2.16$ ° $C) is Source: orcusprep.in

NEET 1999

easy

10.1

100

1.01

1000

Q42. A 5% solution of cane sugar (mol. wt. = 342) is isotonic with 1% solution of a substance X. The molecular weight of X is Source: orcusprep.in

NEET 1998

easy

68.4

171.2

34.2

136.8

Q43. The vapour pressure of $ CCl_{4} $ at 25$ ° $C is 143 mm Hg. If 0.5 g of a non-volatile solute (mol. weight = 65) is dissolved in 100 g $ CCl_{4} $, the vapour pressure of the solution will be Source: orcusprep.in

NEET 1996

medium

199.34 mm Hg

143.99 mm Hg

141.43 mm Hg

94.39 mm Hg.

Q44. The relationship between osmotic pressure at 273 K when 10 g glucose ($ p_{1} $), 10 g urea ($ p_{2} $), and 10 g sucrose ($ p_{3} $) are dissolved in 250 mL of water is Source: orcusprep.in

NEET 1996

easy

$ p_{2} > p_{1} > p_{3} $

$ p_{2} > p_{3} > p_{1} $

$ p_{1} > p_{2} > p_{3} $

$ p_{3} > p_{1} > p_{2} $

Q45. According to Raoult’s law, the relative lowering of vapour pressure for a solution is equal to Source: orcusprep.in

NEET 1995

easy

mole fraction of solute

mole fraction of solvent

moles of solute

moles of solvent.

Q46. If 0.1 M solution of glucose and 0.1 M solution of urea are placed on two sides of the semipermeable membrane to equal heights, then it will be correct to say that Source: orcusprep.in

NEET 1992

easy

there will be no net movement across the membrane

glucose will flow towards glucose solution

urea will flow towards glucose solution

water will flow from urea solution to glucose.

Q47. Which one is a colligative property? Source: orcusprep.in

NEET 1992

easy

Boiling point

Vapour pressure

Osmotic pressure

Freezing point

Q48. Blood cells retain their normal shape in solution which are Source: orcusprep.in

NEET 1991

easy

hypotonic to blood

isotonic to blood

hypertonic to blood

equinormal to blood.

Q49. The relative lowering of the vapour pressure is equal to the ratio between the number of Source: orcusprep.in

NEET 1991

easy

solute molecules to the solvent molecules

solute molecules to the total molecules in the solution

solvent molecules to the total molecules in the solution

solvent molecules to the total number of ions of the solute.

Q50. The van’t Hoff factor (i) for a dilute aqueous solution of the strong electrolyte barium hydroxide is Source: orcusprep.in

NEET-II 2016

easy

0

1

2

3

Q51. The boiling point of 0.2 mol $ kg^{-1} $ solution of X in water is greater than equimolal solution of Y in water. Which one of the following statements is true in this case? Source: orcusprep.in

NEET 2015, Cancelled

medium

Molecular mass of X is less than the molecular mass of Y.

Y is undergoing dissociation in water while X undergoes no change.

X is undergoing dissociation in water.

Molecular mass of X is greater than the molecular mass of Y.

Q52. Of the following 0.10 m aqueous solutions, which one will exhibit the largest freezing point depression? Source: orcusprep.in

NEET 2014

easy

KCl

$ C_{6}H_{12}O_{6} $

$ Al_{2}(SO_{4})_{3} $

$ K_{2}SO_{4} $

Q53. The van’t Hoff factor i for a compound which undergoes dissociation in one solvent and association in other solvent is respectively Source: orcusprep.in

NEET 2011

easy

less than one and greater than one

less than one and less than one

greater than one and less than one

greater than one and greater than one.

Q54. The freezing point depression constant for water is –1.86 $ ° $C $ m^{-1} $. If 5.00 g $ Na_{2}SO_{4} $ is dissolved in 45.0 g $ H_{2}O $, the freezing point is changed by –3.82 $ ° $C. Calculate the van’t Hoff factor for $ Na_{2}SO_{4} $. Source: orcusprep.in

NEET 2011

medium

2.05

2.63

3.11

0.381

Q55. A 0.1 molal aqueous solution of a weak acid is 30% ionized. If $ K_{f} $ for water is 1.86$ ° $C/m, the freezing point of the solution will be Source: orcusprep.in

Mains NEET 2011

medium

– 0.18 $ ° $C

– 0.54 $ ° $C

– 0.36 $ ° $C

– 0.24 $ ° $C

Q56. An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase? Source: orcusprep.in

NEET 2010

easy

Addition of NaCl

Addition of $ Na_{2}SO_{4} $

Addition of 1.00 molal KI

Addition of water

Q57. A 0.0020 m aqueous solution of an ionic compound $ [Co(NH_{3})_{5}(NO_{2})]Cl $ freezes at –0.00732 $ ° $C. Number of moles of ions which 1 mol of ionic compound produces on being dissolved in water will be ($ K_{f} $ = –1.86 $ ° $C/m) Source: orcusprep.in

NEET 2009

medium

3

4

1

2

Q58. 0.5 molal aqueous solution of a weak acid (HX) is 20% ionised. If $ K_{f} $ for water is 1.86 K kg $ mol^{-1} $, the lowering in freezing point of the solution is Source: orcusprep.in

NEET 2007

medium

0.56 K

1.12 K

–0.56 K

–1.12 K

Q59. Which of the following 0.10 m aqueous solution will have the lowest freezing point? Source: orcusprep.in

NEET 1997

easy

KI

C12H22O11

Al2(SO4)3

C5H10O5

Q60. Which of the following salts has the same value of van’t Hoff factor (i) as that of $ K_{3}[Fe(CN)_{6}] $? Source: orcusprep.in

NEET 1994

medium

Na2SO4

Al(NO3)3

Al2(SO4)3

NaCl

Q61. At 25$ ° $C, the highest osmotic pressure is exhibited by 0.1 M solution of Source: orcusprep.in

NEET 1994

easy

glucose

urea

CaCl2

KCl.

Q62. Which of the following aqueous solution has minimum freezing point? Source: orcusprep.in

NEET 1991

medium

0.01 m NaCl

0.005 m C2H5OH

0.005 m MgI2

0.005 m MgSO4

Q63. The density of 1 M solution of compound X is 1.25 g $ mL^{-1} $. The correct option for the molality of solution is (Molar mass of compound, X = 85 g $ mol^{-1} $) Source: orcusprep.in

NEET 2023

hard

0.705 m

1.208 m

1.165 m

0.858 m

Q64. In one molal solution that contains 0.5 mole of a solute, there is Source: orcusprep.in

NEET 2022

easy

500 mL of solvent

500 g of solvent

100 mL of solvent

1000 g of solvent.

Q65. The Henry's law constant $ (K_{H}) $ values of the gases (A, B, C) in water are 145, $ 2 \times 10^{-5} $ and 35 kbar, respectively. The solubility of these gases in water follow the order: Source: orcusprep.in

NEET 2024

easy

B > A > C

B > C > A

A > C > B

A > B > C

Q66. The correct option for the value of vapour pressure of a solution at 45$ ° $C with benzene to octane in molar ratio 3:2 is
[At 45$ ° $C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume ideal gas] Source: orcusprep.in

NEET 2021

medium

350 mm of Hg

160 mm of Hg

168 mm of Hg

336 mm of Hg

Q67. The plot of osmotic pressure ($ \pi $) vs concentration (mol $ L^{-1} $) for a solution gives a straight line with slope 25.73 L bar $ mol^{-1} $. The temperature at which the osmotic pressure measurement is done is (Use R = 0.083 L bar $ mol^{-1} $ $ K^{-1} $) Source: orcusprep.in

NEET 2022

easy

37$ ° $C

310 $ ° $C

25.73 $ ° $C

12.05 $ ° $C

Q68. The following solutions were prepared by dissolving 10 g of glucose ($ C_{6}H_{12}O_{6} $) in 250 mL of water ($ P_{1} $), 10 g of urea ($ CH_{4}N_{2}O $) in 250 mL of water ($ P_{2} $) and 10 g of sucrose ($ C_{12}H_{22}O_{11} $) in 250 mL of water ($ P_{3} $). The right option for the decreasing order of osmotic pressure of these solutions is Source: orcusprep.in

NEET 2022

easy

$ P_{2} > P_{1} > P_{3} $

$ P_{1} > P_{2} > P_{3} $

$ P_{3} > P_{1} > P_{2} $

$ P_{1} > P_{3} > P_{2} $

Q69. Which amongst the following aqueous solutions of electrolytes will have minimum elevation in boiling point? Source: orcusprep.in

NEET 2021

easy

0.05 M NaCl

0.1 M KCl

0.1 M MgSO4

1 M NaCl

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Chemistry - Solutions-PYQ

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Chemistry - Solutions-PYQ

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