SOLUTIONS Quiz-4

Solutions Quiz-4

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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. The molal elevation constant of water = 0.52 K m^{(-1 )}. The boiling point of 1.0 molal aqueous KCl solution (assuming complete dissociation of KCl) should be

•  100.52℃
•  101.04℃
•  99.48℃
•  98.96℃

Solution

Q2.The freezing point of 1 m NaCl solution assuming NaCl to be 100% dissociated in water is (K_f=1.86 K m^(-1))

•  -1.86℃
•  -3.72℃
•  +1.86℃
•  +3.72℃

Solution

Q3.  The freezing point of a 0.05 molal solution of non-electrolyte in water is (K_f=1.86 K m^(-1))

•  -1.86℃
•  -0.93℃
•  -0.093℃
•  0.093℃

Solution

Q4. An aqueous solution freezes at -0.186℃ (K_f=1.86°;K_b=0.512°). What is the elevation in boiling point?

•  0.186
•  0.512
•  0.512/1.86
•  0.0512

Solution

Q5.For a dilute solution, Raoult’s law states that

•  The lowering of vapour pressure is equal to the mole fraction of the solute
•  The relative lowering of vapour pressure is equal to the mole fraction of the solute
•  The relative lowering of vapour pressure is proportional to the amount of solute in the solution
•  The vapour pressure of the solution is equal to the mole fraction of the solvent

Solution

Q6. Based on the given diagram, which of the following statements regarding the solutions of two miscible volatile liquids are correct? Plots AD and BC show that Raoult''s law is obeyed for the solution in which B is a solvent and A is the solute and as well as for that in which. A is solvent and B is solute Plot CD shows that Dalton''s law of partial pressures is observed by the binary solutions of components A and B EF+EG=EH; and AC and BD corresponds to the vapour pressures of the pure solvents A and B, respectively

Select the correct answer using the codes given below: Codes:

•  1 and 2
•  2 and 3
• 1 and 3
•  1, 2, and 3

Solution
d) 1, 2, and 3

Q7.An aqueous solution of methanol in water has vapour pressure

•  Equal to that of water
•  Equal to that of methanol
•  More than that of water
•  Less than that of water

Solution

Q8.Solution distilled without change in composition at a temperature is called

•  Amorphous₂ (SO₄ )₃
•  Azeotropic mixture₂
•  Ideal solution₂ SO₄
•  Super saturated solution

Solution

Q9.The osmotic pressure of a 5% (weight/volume) solution of cane sugar at 150℃ is

•  4 atm
•  3.4 atm
•  5.078 atm
•  2.45 atm

Solution

Q10. The lowering of vapour pressure due to a solute in a 1 m aqueous solution at 100℃ is

•  13.44 torr
•  14.12 torr
•  312 torr
• 352 torr

Solution

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