Home
Class 12
CHEMISTRY
If Vapour pressure of pure liquids 'A' ...

If Vapour pressure of pure liquids 'A' & 'B' are 300 and 800 torr respectively at `25^@C`. When these two liquids are mixed at this temperature to from a solution in which mole percentage of 'B' is 92, then the total vapour pressure is observed to be `0.95` atm. Which of the following is true for this solution.

A

`DeltaV_("mix") gt 0`

B

`DeltaH_("mix") lt 0`

C

`DeltaV_("mix")=0`

D

`DeltaH_("mix")=0`

Text Solution

Verified by Experts

The correct Answer is:
B
According to Raoult's law
`P_(T)=(0.08xx300+0.92xx800)` torr
`=(24+736)` torr
= 760 torr =1 atm
`P_(exp)=0.95 "atm" lt 1 "atm"`
Hence the solution shows `-ve` deviation
so `DeltaH_("mix")lt 0 ,and DeltaV_("mix") lt 0`
Promotional Banner

Topper's Solved these Questions

  • SOLUTIONS

    A2Z|Exercise Relative Lowering Of Vapour Pressure|24 Videos

  • SOLUTIONS

    A2Z|Exercise Elevation Of Boiling Point|21 Videos

  • SOLUTIONS

    A2Z|Exercise Vapour Pressure And Henry'S Law|18 Videos

  • SOLID STATE

    A2Z|Exercise Section D - Chapter End Test|30 Videos

  • SURFACE CHEMISTRY

    A2Z|Exercise Section D - Chapter End Test|30 Videos

Similar Questions

Explore conceptually related problems

The vapour pressure of two pure liquids (A) and (B) are 100 and 80 torr respectively. The total pressure of solution obtained by mixing 2 mole of (A) and 3 mole of (B) would be :-

The vapour pressure of two pure liquids A and B are 50 and 40 torr respectively. If 8 moles of A is mixed with x moles of B, then vapour pressure of solution obtained is 48 torr. Calculate the value of x.

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 mole of P and 2 mol of Q would be

The vapour pressure of two pure liquids A and B are 50 and 40 torr respectively. If 8 molrs of A is mixed with x moles of B , then vapour pressure of solution obtained is 48 torr. What is the value of x.

The vapour pressures of pure liquids A and B are 0.600 bar and 0.933 bar respectively, at a certain temperature. What is the mole fraction of solute when the total vapour pressure of their mixture is 0.8 bar?

The vapour pressures of pure liquids A and B are 400 and 600 mm Hg respectively at 298 K. On mixing the two liquids, the sum of their initial volumes is equal to the volume of the final mixture. The mole fraction of liquid B is 0.5 in the mixture. The vapour pressure of the final solution, the mole fractions of components A and B in vapour phase, respectively are :

The vspour preesure of two pure liquids A and B are 5 and 10 torr respectively. Calculte the total pressure of the solution (in torr) obtainrd by mixing 2 mole of A and 3 mole of B.

The vapour pressure of two liquids P and Q are 100 and 50 torr, respectively. The total vapour pressure of solution obtained by mixing 3 moles of P and 2 moles of Q would be

A2Z-SOLUTIONS-Raoult'S Law, Ideal And Non-Ideal Solutions, Azeotropes
  1. Total Vapour pressure of mixture of 1molA(p(A)^(0)=150 "torr")and 2mol...

    Text Solution

    |

  2. Which of the following is less than zero for ideal solutions ?

    Text Solution

    |

  3. If Vapour pressure of pure liquids 'A' & 'B' are 300 and 800 torr res...

    Text Solution

    |

  4. Which of the following shows negative deviation from Raoult's law?

    Text Solution

    |

  5. A maximum or minima obtained in the temperature, composition curve of ...

    Text Solution

    |

  6. A liquid is kept in a closed vessel. If a glass plate (negligible mass...

    Text Solution

    |

  7. Given at 350K, p(A)^@=300 "torr" and p(B)^@=800 "torr" the composition...

    Text Solution

    |

  8. The vapour pressure of the solution of two liquids A(P^@=80mm) and B(P...

    Text Solution

    |

  9. In mixture A and B ,components show -ve deviations as:

    Text Solution

    |

  10. If liquids A and B from an ideal solution, than :

    Text Solution

    |

  11. Which liquids pair shows a positive deviation from Raoult's law?

    Text Solution

    |

  12. Benzene and toluene form nearly ideal solutions.At 20^@C, the vapour p...

    Text Solution

    |

  13. A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of...

    Text Solution

    |

  14. At 80^@C, the vapour pressure of pure liquid A is 520 mm Hg and that o...

    Text Solution

    |

  15. The vapour pressure of water at20^@Cis 17.5mmHg.if 18gof glucose (C(6)...

    Text Solution

    |

  16. For A and B to form an ideal solution which of the following condition...

    Text Solution

    |

  17. A binary liquid solution of n-heptane and ethyl alcohol is prepared wh...

    Text Solution

    |

  18. The mole fraction of toluene in vapour phase which is in equlibrium wi...

    Text Solution

    |

  19. Two liquids are mixed together to from a mixture which boils at same t...

    Text Solution

    |

  20. At35^@C the vapour of pure chlorofrom si 0.359atm and that of pure ace...

    Text Solution

    |