Home
Class 12
CHEMISTRY
A non-volatile solute (A) is dissolved i...

A non-volatile solute (A) is dissolved in a volatile solvent (B). The vapour pressure of the resultant solution is `P_(s^(*))`. The vapour pressure of pure solvent is `P_(B)^(@)`. If `X_(B)` is the mole fraction of the solvent, which of the following is correct?

A

`P_(s) = X_(A).P_(B)^(@)`

B

`P_(B)^(@) =P_(s).X_(A)`

C

`P_(S)= X_(B).P_(B)^(@)`

D

`P_(B)^(@)= P_(s). X_(B)`

Text Solution

Verified by Experts

The correct Answer is:
( c)
According to Raoult's law, the vapour pressure of resultant solution is equal to the product of mole fraction and vapour pressure of pure solvent.
`P_(s)=X_(8)P_(B)^(0)`
Promotional Banner

Topper's Solved these Questions

  • SAMPLE PAPER 2017

    SIA PUBLICATION|Exercise CHEMISTRY|37 Videos

  • STATES OF MATTER

    SIA PUBLICATION|Exercise M.C.Q.|58 Videos

Similar Questions

Explore conceptually related problems

The vapour pressure of a solution containing non volatile solute is less than the vapour pressure of pure of solvent. Give reason.

When some amount of non-volatile solute is dissolved in a solvent to prepare a dilute solution, the vapour pressure of the solvent is lowered and it is directly proportional to the mole fraction of solvent in the solution . Relative lowering in vapour pressure is equal to mole fraction of solute . Elevation in boiling point of solvent is a collgative property like lowering in vaour pressure of solvent in solution , K_(b) i.e., molal elevation constant is calculated by the formula, K_(b)=DeltaT_(b)// molality and also by the expression, K_(b)=RT_(b)^(2)//1000l_(v) where T_(b) is boiling point of solvent and I_(v) is latent heat of vapourisation for 1 gm solvent . Abnormal elevation is boiling point =iX elevation in boiling point in ideal solution where i=van't Hoff factor Lowering in vapour pressure in an experiment was found to be x mm of Hg. It is : Lowering in vapour pressure in an experiment was found to be x mm of Hg. It is

When some amount of non-volatile solute is dissolved in a solvent to prepare a dilute solution, the vapour pressure of the solvent is lowered and it is directly proportional to the mole fraction of solvent in the solution . Relative lowering in vapour pressure is equal to mole fraction of solute . Elevation in boiling point of solvent is a collgative property like lowering in vaour pressure of solvent in solution , K_(b) i.e., molal elevation constant is calculated by the formula, K_(b)=DeltaT_(b)// molality and also by the expression, K_(b)=RT_(b)^(2)//1000l_(v) where T_(b) is boiling point of solvent and I_(v) is latent heat of vapourisation for 1 gm solvent . Abnormal elevation is boiling point =iX elevation in boiling point in ideal solution where i=van't Hoff factor Relative lowering in vapour pressure :

When some amount of non-volatile solute is dissolved in a solvent to prepare a dilute solution, the vapour pressure of the solvent is lowered and it is directly proportional to the mole fraction of solvent in the solution . Relative lowering in vapour pressure is equal to mole fraction of solute . Elevation in boiling point of solvent is a collgative property like lowering in vaour pressure of solvent in solution , K_(b) i.e., molal elevation constant is calculated by the formula, K_(b)=DeltaT_(b)// molality and also by the expression, K_(b)=RT_(b)^(2)//1000l_(v) where T_(b) is boiling point of solvent and I_(v) is latent heat of vapourisation for 1 gm solvent . Abnormal elevation is boiling point =iX elevation in boiling point in ideal solution where i=van't Hoff factor Molal elevation (K_(b))

The vapour pressure of water at room temperature is 23.8 mm Hg. The vapour pressure of an aqueous solution of sucrose with mole fraction 0.1 is equal to :

When 25 g of a non-volatile solute is dissolved in 100g of water, the vapour pressure is lowered by 2.25 xx 10^(-1)mm . If the vapour pressure of water at 20^(@)C is mm, what is the molecular weight of the solute?

Vapour pressure of an aqueous solution is 2% less than that of the solvent. The molality of the solution is

SIA PUBLICATION-SOLUTIONS-MCQ
  1. The vapour pressure in mm of Hg, of an aqueous solution obtained by ad...

    Text Solution

    |

  2. The weight in grams of a non-volatile solute (mol.wt.60) to be dissolv...

    Text Solution

    |

  3. The volume in mL of 0.1 M solutions of NaOH required to completely neu...

    Text Solution

    |

  4. Which of the following is the ratio of the lowering of vapour pressure...

    Text Solution

    |

  5. If BaCl(2) ionizes to an extent of 80% in aqueous solution,the value o...

    Text Solution

    |

  6. X is non-valatile solute and Y is a volatile solvent. The following va...

    Text Solution

    |

  7. During the depression in freezing point experiment, an equilibrium is ...

    Text Solution

    |

  8. When 25 g of a non-volatile solute is dissolved in 100g of water, the ...

    Text Solution

    |

  9. 138 g of ethyl alcohol is mixed with 72 g of water. The ratio of mole ...

    Text Solution

    |

  10. The vapour pressure of water at 23^(@)C is 19.8 mm. 0.1 mole of glucos...

    Text Solution

    |

  11. x gm of water is mixed with 69 gm of ethanol . The mole fraction of et...

    Text Solution

    |

  12. A non-volatile solute (A) is dissolved in a volatile solvent (B). The ...

    Text Solution

    |

  13. 10.6 g of a substance of molecular weight 106 was dissolved in 100 ml ...

    Text Solution

    |

  14. The weight (in gram), of KCl (mol. wt. = 74.5) in 100 ml of a 0.1 M KC...

    Text Solution

    |

  15. 5.85g of NaCl (mol. wt. 58.5) is dissolved in water and the solution i...

    Text Solution

    |

  16. A solution that obeys Raoult's law is called

    Text Solution

    |

  17. If 20 mL of 0.4 N NaOH solution completely neutralised 40 mL of a diba...

    Text Solution

    |

  18. The relative lowering of vapour pressure is equal to

    Text Solution

    |

  19. 9.8 g of H(2)SO(4) is present in two litres of a solution. The molarit...

    Text Solution

    |

  20. The weight of oxalic acid crystals,H(2)C(2)O(4)2H(2)O required to prep...

    Text Solution

    |