NEET Chemistry - New - Solutions

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Question - 1

Which one of the following is incorrect for ideal solution?

  • A ΔHmix = 0
  • B ΔUmix = 0
  • C ΔP = Pobs- Pcalculate by Raoult's law= 0
  • D ΔGmix= 0

Question - 2

Which of the following statements about the composition of the vapour over an ideal 1: 1 molar mixture of benzene and toluene is correct? Assume that the temperature is constant at 25°C. (Given, vapour pressure data at 25°C, benzene = 12.8 kPa, toluene = 3.85 kPa)

  • A The vapour will contain equal amounts of benzene and toluene
  • B Not enough information is given to make a prediction
  • C The vapour will contain a higher percentage of benzene.
  • D The vapour will contain a higher percentage of toluene

Question - 3

Which one is not equal to zero for an ideal solution?

  • A ΔHmix
  • B ΔSmix
  • C ΔVmix
  • D ΔP=Pobserved - PRaoult's

Question - 4

What is the mole fraction of the solute in a 1.00 m aqueous solution?

  • A 0.177
  • B 1.770
  • C 0.0354
  • D 0.0177

Question - 5

PA and PB are the vapour pressure of pure liquid components A and B, respectively of an ideal binary solution. If XA represents the mole fraction of component A, the total pressure of the solution will be:

  • A PA + XA (PB - PA)
  • B PA + XA (PA - PB)
  • C PB + XA (PB - PA)
  • D PB + XA (PA - PB)

Question - 6

An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase?

  • A Addition of NaCl
  • B Addition of Na2SO4
  • C Addition of 1.00 molal KI
  • D Addition of water

Question - 7

25.3 g of sodium carbonate, Na2CO3 is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, Na+ and carbonate ion, CO32- are respectively (Molar mass of Na2CO3 = 106 g mol-1)

  • A 0955M and 1.910M
  • B 1.910M and 0.955M
  • C 1.90M and 1.910M
  • D 0.477M and 0.477M

Question - 8

Concentrated aqueous sulphuric acid is 98% H2SO4 by mass and has a density of 1.80 gmL-1 Volume of acid required to make one liter of 0.1M H2SO4 solution is :

  • A 11.10 mL
  • B 16.65 mL
  • C 22.20 mL
  • D 5.55 mL

Question - 9

A solution has 1: 4 mole ratio of pentane to hexane. The vapour pressure of the pure hydrocarbons at 20°C are 440 mm of Hg for pentane and 120 mm of Hg for hexane. The mole fraction of pentane in the vapour phase would be :

  • A 0.549
  • B 0.200
  • C 0.786
  • D 0.478

Question - 10

The vapour pressure of two liquids P and Q are 80 and 60 torr, respectively. The total vapour pressure of solution obtained by mixing 3 moles of P and 2 moles of Q would be :

  • A 140 torr
  • B 20 torr
  • C 68 torr
  • D 72 torr