If 2 gm of NaOH is present is 200 ml of its solution, its molarity will be
  • 0.25
  • 0.5
  • 5
  • 10
The atmospheric pollution is generally measured in the units of
  • mass percentage
  • volume percentage
  • volume fraction
  • ppm
A 5% solution of cane-sugar (molecular weight = 342) is isotonic with 1% solution of substance A. The molecular weight of X is
  • 342
  • 171.2
  • 68.4
  • 136.8
H
  • 0.0263 bar
  • 69.16 bar
  • 192 bar
  • 282 bar
Atomic mass is equal to
  • number of electrons of an atom
  • sum of the numbers of electrons and protons of an atom
  • sum of the numbers of neutrons and protons of an atom
  • none of these
Henry’s law constant for molality of methane is benzene at 298 K is 4.27 × 10
  • 1.78 × 10
  • 17.43
  • 0.114
  • 2.814
How much oxygen is dissolved in 100 rnL water at 298 K if partial pressure of oxygen is 0.5 atm and K = 1.4 × 10
  • 22.4 mg
  • 22.4 g
  • 2.24 g
  • 2.24 mg
The law which indicates the relation’-hip between solubility of a gas in liquid and pressure rs
  • Raoult’s law
  • Henry’s law
  • Lowering of vapour pressure
  • Van’t Hoff law
Among the following substances the lowest vapour pressure is exerted by
  • water
  • alcohol
  • ether
  • mercury
Vapour pressure of a pure liquid X is 2 atm at 300 K. It is lowered to 1 atm on dissolving 1 gof Y in 20 g of liquid X. If molar mass of X is 200, what is the molar mass of Y?
  • 20
  • 50
  • 100
  • 200
Partial pressure of a solution component is directly proportional to its mole fraction. This is known as
  • Henry’s law
  • Raoult’s law
  • Distribution law
  • Ostawald’s dilution law
3 moles of P and 2 moles of Q are mixed, what will be their total vapour pressure in the solution if their partial vapour pressures are 80 and 60 torr respectively?
  • 80 torr
  • 140 torr
  • 72 torr
  • 70 torr
Which of the following solutions shows positive deviation from Raoult’s law?
  • Acetone + Aniline
  • Acetone + Ethanol
  • Water + Nitric acid
  • Chloroform + Benzene
The system that forms maximum boilingazetrope is
  • Acetone-chloroform
  • ethanol-acetone
  • n-hexane-n-heptane
  • carbon disulphide-acetone
A plant cell shrinks when it is kept in a
  • hypotonic solution
  • hypertonic solution
  • isotonic solution
  • pure water
The relative lowering in vapour pressure is proportional to the ratio of number of
  • solute molecules to solvent molecules
  • solvent molecules to solute molecules
  • solute molecules to the total number of molecules in solution
  • solvent molecules to the total number of molecules in solution
A solution containing 10.2 g glycerine per litre is isotonic with a 2% solution of glucose. What is the molecular mass of glycerine?
  • 91.8 g
  • 1198 g
  • 83.9 g
  • 890.3 g
What weight of glycerol should be added to 600 g of water in order to lower its freezing point by 10°C ?
  • 496 g
  • 297 g
  • 310 g
  • 426 g
The osmotic pressure of a solution can be increased by
  • increasing the volume
  • increasing the number of solute molecules
  • decreasing the temperature
  • removing semipermeable membrane
Sprinkling of salt helps in clearing the snow covered roads in hills. The phenomenon involved in the process is
  • lowering in vapour pressure of snow
  • depression in freezing point of snow
  • melting of ice due to increase in temperature by putting salt
  • increase in freezing point of snow
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