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CBSE Questions for Class 11 Medical Chemistry States Of Matter Gases And Liquids Quiz 15 - MCQExams.com

Two liquids A and B form an ideal solution. the solution has a vapor pressure of 700 torrs at 800C. it is distilled till 2/3rd of the solution is collected as condensate. the composition of the condensate xA=0.75. and that of residue is xA=0.30 if the vapor pressure of the residue at 800C is 600 torr. which of the following is/are true? 
  • The composition of the original liquid was xA=0.6
  • The composition of the original liquid was xA=0.4
  • P0A=25003Torr
  • P0B=500Torr
For ideal binary solution
p=x_{A}.p_{A}^{0}+x_{B}.p_{B}^{0}
This equation reflects

  • Boyle's law
  • Charles's law
  • Dalton's law of partial pressure
  • none of these
The reading of pressure gauge at which only liquid phase exists
  • 499
  • 399
  • 299
  • none
Which of the following solution in water possesses the lowest vapour pressure?
  • 0.1 (M) NaCl
  • 0.1 (M) BaCl_2
  • 0.1 (M) KCl
  • None of these
60 \,gm of Urea (Mol. wt 60) was dissolved in 9.9 moles of water. If the vapour pressure of pure water is P_0 , the vapour pressure of solution is
  • 0.10 \,P_0
  • 1.10 \,P_0
  • 0.90 \,P_0
  • 0.99 \,P_0
The vapour pressure lowering caused by the addition of 100 \,g of sucrose (molecular mass = 342) to 1000 \,g of water if the vapour pressure of pure water at 25 ^\circ C is 23.8 \,mm \,Hg
  • 1.25 \,mm \,Hg
  • 0.125 \,mm \,Hg
  • 1.15 \,mm \,Hg
  • 00.12 \,mm \,Hg
5 \,cm^3 of acetone is added to 100 \,cm^3 of water, the vapour pressure of water over the solution
  • It will be equal to the vapour pressure of pure water
  • It will be less than the vapour pressure of pure water
  • It will be greater than the vapour pressure of pure water
  • It will be very large
According to kinetic theory of gases, the energy per mole of a gas is equal to
  • 1.5RT
  • RT
  • 0.5RT
  • 2.5RT
The pressure P of a gas is plotted against its absolute temperature T for two different constant volumes, V_{1} and V_{2}. when V_{1} > V_{2}, the:
  • Curves have the same slope and do not intersect
  • Curves must intersect at some point other than T = 0
  • Curve for V_{2} has a greater slope than that for V_{1}
  • Curve for V_{1} has a greater slope than that for V_{2}
Which has maximum vapour pressure?
  • HI
  • HBr
  • HCl
  • HF
All kinds of matter:
  • occupy space and have a definite mass
  • have mass and a definite shape
  • can change their states
  • have a definite volume
Solids and liquids are considered phases of matter.
  • True
  • False
Two which of the following the Dalton's law of particle pressure is not applicable?
  • H_2 and He
  • NH_3 and HCl
  • N_2 and H_2
  • N_2 and O_2
Which of the following is not a colligative property?
  • Vapour pressure
  • Depression in f. pt.
  • Elevation in b. pt.
  • Osmotic pressure
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice:

Assertion: The vapour pressure of an aqueous solution is less than 1.013 bar at 373.15 K.
Reason: Vapour pressure of water is 1.013 bar at 373.15K.
  • If both assertion and reason are true and reason is the correct explanation of assertion.
  • If both assertion and reason are true but reason is not the correct explanation of assertion
  • If assertion is true but reason is false.
  • If both assertion and reason are false.
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Practice Class 11 Medical Chemistry Quiz Questions and Answers