PYQSide ExamsMy practice

Solutions · Question 13

NEET (UG) 2021MCQEasy📈 Topic in 25% papers+4−1
1

The following solutions were prepared by dissolving 10 g of glucose ( C6H12O6) in 250 ml of water (P1), 10 g of urea (CH4N2O) in 250 ml of water (P2) and 10 g of sucrose ( C12H22O11) in 250 ml of water (P3). The right option for the decreasing order of osmotic pressure of these solutions is :

  1. P3 > P1 > P2
  2. P2 > P1 > P3
  3. P1 > P2 > P3
  4. P2 > P3 > P1

Answer

(2) P2 > P1 > P3

Solution

= CRT = nVRT; with equal mass (10 g) and equal volume, n 1M (all are non-electrolytes).

Molar masses: urea = 60, glucose = 180, sucrose = 342 g mol-1

∴ : urea > glucose > sucrose ⇒ P2 > P1 > P3

Answer: (2)

NEET (UG) 2021

Keep practising — Solutions

2

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 solution]

  1. 350 mm of Hg
  2. 160 mm of Hg
  3. 168 mm of Hg
  4. 336 mm of Hg
NEET (UG) 2021
3

The freezing point depression constant (Kf) 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 :

  1. 0.80 K
  2. 0.40 K
  3. 0.60 K
  4. 0.20 K
NEET (UG) 2020
4

The mixture which shows positive deviation from Raoult's law is :

  1. Benzene + Toluene
  2. Acetone + Chloroform
  3. Chloroethane + Bromoethane
  4. Ethanol + Acetone
NEET (UG) 2020
5

For an ideal solution, the correct option is :

  1. mix H = 0 at constant T and P
  2. mix G = 0 at constant T and P
  3. mix S = 0 at constant T and P
  4. mix V 0 at constant T and P
NEET (UG) 2019
6

The mixture that forms maximum boiling azeotrope is :

  1. Ethanol + Water
  2. Acetone + Carbon disulphide
  3. Heptane + Octane
  4. Water + Nitric acid
NEET (UG) 2019
7

If molality of the dilute solution is doubled, the value of molal depression constant (Kf) will be

  1. halved
  2. tripled
  3. unchanged
  4. doubled.
NEET 2017
8

Which of the following is dependent on temperature?

  1. Molarity
  2. Mole fraction
  3. Weight percentage
  4. Molality
NEET 2017
9

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 . (Given, vapour pressure data at 25 , benzene = 12.8 kPa, toluene = 3.85 kPa)

  1. The vapour will contain equal amounts of benzene and toluene.
  2. Not enough information is given to make a prediction.
  3. The vapour will contain a higher percentage of benzene.
  4. The vapour will contain a higher percentage of toluene
NEET 2016 (Phase 1)
10

At 100 the vapour pressure of a solution of 6.5 g of a solute in 100 g water is 732 mm. If Kb = 0.52, the boiling point of this solution will be

  1. 102
  2. 103
  3. 101
  4. 100
NEET 2016 (Phase 1)
11

The van't Hoff factor (i) for a dilute aqueous solution of the strong electrolyte barium hydroxide is

  1. 0
  2. 1
  3. 2
  4. 3
NEET 2016 (Phase 2)

All Solutions PYQs →

PDFDownload Solutions PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Chemistry chapters
Physical ChemistrySome Basic Concepts of ChemistryStructure of AtomStates of MatterThermodynamicsEquilibriumRedox ReactionsSolid StateSolutionsElectrochemistryChemical KineticsSurface Chemistry
Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular StructureHydrogens-Block Elementsp-Block Elements (Group 13 & 14)Environmental ChemistryGeneral Principles of Isolation of Elementsp-Block Elements (Group 15–18)d- and f-Block ElementsCoordination Compounds
Organic ChemistryOrganic Chemistry – Some Basic Principles and TechniquesIsomerismHydrocarbonsHaloalkanes and HaloarenesAlcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAminesBiomoleculesPolymersChemistry in Everyday LifePrinciples Related to Practical Chemistry