PYQSide ExamsMy practice

Solutions · Question 48

AIPMT 2005MCQEasy📈 Topic in 0% papers+4−1
1

A solution of urea (mol. mass 60 g mol-1) boils at 100.18 at the atmospheric pressure. If Kf and Kb for water are 1.86 and 0.512 K kg mol-1 respectively, the above solution will freeze at

  1. 0.654
  2. -0.654
  3. 6.54
  4. -6.54

Answer

(2) -0.654

Solution

Tb = 100.18 - 100 = 0.18 K

Tb = Kb m and Tf = Kf m (same molality m)

Tf Tb = KfKb

Tf = 0.18 1.860.512

= 0.654 K

Freezing point = 0 - 0.654 = -0.654

(The molar mass of urea is not needed.)

Answer: (2)

AIPMT 2005

Keep practising — Solutions

2

Formation of solution from two components can be considered as (i) Pure solvent separated solvent molecules, H1 (ii) Pure solute separated solute molecules, H2 (iii) Separated solvent and solute molecules solution, H3 Solution so formed will be ideal if

  1. Hsoln = H1 + H2 + H3
  2. Hsoln = H1 + H2 - H3
  3. Hsoln = H1 - H2 - H3
  4. Hsoln = H3 - H1 - H2
AIPMT 2003
3

A solution containing components A and B follows Raoult's law when

  1. A-B attraction force is greater than A-A and B-B
  2. A-B attraction force is less than A-A and B-B
  3. A-B attraction force remains same as A-A and B-B
  4. volume of solution is different from sum of volumes of solute and solvent
AIPMT 2002
4

A solution contains non-volatile solute of molecular mass M2. Which of the following can be used to calculate the molecular mass of solute in terms of osmotic pressure?

  1. M2 = ( m2 )VRT
  2. M2 = ( m2V ) RT
  3. M2 = ( m2V ) RT
  4. M2 = ( m2V ) RT
AIPMT 2002
5

Pure water can be obtained from sea water by

  1. centrifugation
  2. plasmolysis
  3. reverse osmosis
  4. sedimentation
AIPMT 2001
6

From the colligative properties of solution, which one is the best method for the determination of molecular weight of proteins and polymers?

  1. Osmotic pressure
  2. Lowering in vapour pressure
  3. Lowering in freezing point
  4. Elevation in boiling point
AIPMT 2000

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