SOLUTIONS Quiz-5

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Solutions Quiz-5

Dear Readers,

IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies. Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..

Q1. If a thin slice of sugar beet is placed in concentrated solution of NaCl, then

•  Sugar beet will lose water from its cells
•  Sugar beet will absorb water from solution
•  Sugar beet will neither absorb nor lose water
•  Sugar beet will dissolve in solution

Solution

Q2.Two solutions of KNO₃ and CH₃COOH are prepared separately. The molarity of both is 0.1 M and osmotic pressure P₁ and P₂ respectively. The correct relationship between the osmotic pressures is

•  P₂>P₁
•  P₁=P₂
•  P₁>P₂
•  P₁/(P₁+P₂ )=P₂/(P₁+P₂ )

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Q3.  The osmotic pressure of a dilute solution is directly proportional to the

•  Diffusion rate of the solute
•  Ionic concentration
•  Boiling point
•  Flow of solvent from a concentrated solution

Solution

Q4. Each pair forms ideal solution except

•  C₂ H₅ Br and C₂ H₅ I
•  C₆ H₅ Cl and C₆ H₅ Br
•  C₆ H₆ and C₆ H₅CH₃
•  C₂ H₆ I and C₂ H₅ OH

Solution

Q5.The Henry’s law constant for the solubility of N₂ gas in water at 298 K is 1.0 × 105 atm. The mole fraction of N₂ In air is 0.8 The number of moles of N₂ from air dissolved in 10 moles of water of 298 K and 5 atm pressure is

•  4 × 10^(-4)
•  4.0 ×10^(-5)
•  5.0 ×10^(-4)
•  4.0 ×10^(-6)

Solution

Q6. The use of common salts, e.g NaCl or CaCl₂ anhydrous is made to clear snow on the rods. This causes:

•  A lowering in the freezing point of water
•  A lowering in the melting point of ice
• Ice melts at the temperature of atmosphere present at that time
•  All of the above

Solution

Q7.The relative decrease in the vapour pressure of an aqueous solution containing 2 mol [Cu(NH₃ )₃ Cl]Cl in 3 mol H₂ O is 0.50. On reaction with AgNO₃, this solution will form

•  1 mol AgCl
•  0.25 mol AgCl
•  2 mol AgCl
•  0.40 mol AgCl

Solution

Q8.Which of the following 0.1 M aqueous solutions will have the lowest freezing point?

•  Potassium sulphate
•  Sodium chloride
•  Urea
•  Glucose

Solution

Q9.An azeotropic mixture of HCl and water has

•  84% of HCl
•  22.2% HCl
•  63% of HCl
•  20.2% HCl

Solution

Q10. 25 mL of an aqueous solution of KCl was found to require 20 mL of 1 M AgNO₃ solution when titrated using a K₂ CrO₄ as indicator. The depression in freezing point of KCl solution with 100% ionization will be: (K_f=2.0° mol^(-1) kg and molarity = molality)

•  5.0°
•  3.2°
•  1.6°
• 0.8°

Solution

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