Home
Class 12
CHEMISTRY
6 grams of a substance 'A' dissolved in ...

6 grams of a substance 'A' dissolved in 100 g of water freezes at - `0.93^(@)C`. The molecular mass of 'A' is (`K_(f)=1.86 Km^(-1)`).

A

60

B

120

C

180

D

140

Text Solution

Verified by Experts

The correct Answer is:
B
`Delta T_(f)=0-(-0.93)=0.93`
`M_(B)=(K_(f)xx1000xx w_(B))/(w_(A)xx Delta T_(f))`
`=(1.86xx1000xx6)/(100 xx 0.93)=120`
Promotional Banner

Topper's Solved these Questions

  • SOLUTIONS

    MODERN PUBLICATION|Exercise Multiple Choice Questions (Level-I) (Basic conceptual Qs) (Colligative Properties of Electrolyte Solutions)|17 Videos

  • SOLUTIONS

    MODERN PUBLICATION|Exercise Multiple Choice Questions (Level-II) (Comprehensive Qs)|50 Videos

  • SOLUTIONS

    MODERN PUBLICATION|Exercise Multiple Choice Questions (Level-I) (Basic conceptual Qs) (Solubility, Vapour Pressure, Raoult.s Law, Ideal and Non-ideal Solutions)|15 Videos

  • REDOX REACTIONS

    MODERN PUBLICATION|Exercise Recent Examination Questions|6 Videos

  • SOME BASIC CONCEPTS OF CHEMISTRY

    MODERN PUBLICATION|Exercise RECENT EXAMINATION QUESTION|15 Videos

Similar Questions

Explore conceptually related problems

A solution containing 18g of non - volatile non - electrolyte solute is dissolved in 200g of water freezes at 272.07K. Calculate the molecular mass of solute. Given K_(f)=1.86kg//mol and freezing point of water = 273K

15 g of an unknown molecular substance was dissolved in 450 g of water. The resulting solution freezes at - 0.34^(@) C. what is molar mass of the substance ? (K_(f)" for water " = 1.86 k kg " mol"^(-1))

If 10.0 g of a non-electrolyte dissolved in 100 g of water lowers the freezing point of water by 1.86^(@)C , the molar mass of the non-electrolyte is ( K_(f)=1.86 Km^(-1) )

An aqueous solution containing 0.25 moles of a strong electrolyte A in 500 g of water freezes at -2.8^(@)C . How many ions are formed per formula unit of A (K_(f)=1.86^(@)C) ?

A solution of 1.25 g of 'P' in 50 g of water lowers freezing point by 0.3^(@) C . Molar mass of 'P' is 94. K_("(water)") = 1.86 K kg mol^(-1) . The degree of association of ‘P’in water is

MODERN PUBLICATION-SOLUTIONS-Multiple Choice Questions (Level-I) (Basic conceptual Qs) (Colligative Properties)
  1. The molar elevation constant for water is 0.52^(@). The elevation caus...

    Text Solution

    |

  2. A 5% solution of glucose ( molar mass =180 ) is isotonic with a 2.5% s...

    Text Solution

    |

  3. 6 grams of a substance 'A' dissolved in 100 g of water freezes at - 0....

    Text Solution

    |

  4. If 10.0 g of a non-electrolyte dissolved in 100 g of water lowers the ...

    Text Solution

    |

  5. The boiling point of a solution containing 2.62 g of a substance A in ...

    Text Solution

    |

  6. The freezing point of a solution containing 4.8 g of a compound in 60 ...

    Text Solution

    |

  7. The freezing point of a 0.05 molal solution of a non-eletrolyte in wat...

    Text Solution

    |

  8. Osmotic pressure of a sugar solution at 24^(@)C is 2.5 atm. The concen...

    Text Solution

    |

  9. The osmotic pressure of a 3.5% solution of cane sugar at 150^(@)C is :

    Text Solution

    |

  10. When 0.1 mole of glucose is dissolved in 10 mole of water, the vapour ...

    Text Solution

    |

  11. A 0.5 molal solution of ethylene glycol in water is used as coolant in...

    Text Solution

    |

  12. A solution containing 4.2 g of urea in 500 ml was found to be isotonic...

    Text Solution

    |

  13. The osmotic pressure of 5% aqueous solution of glucose (pi(1)) is rela...

    Text Solution

    |

  14. Camphor is often used in molecular mass determination because

    Text Solution

    |

  15. The vapour pressure of two liquids 'P' and 'Q' are 80 and 60 torr resp...

    Text Solution

    |

  16. A solution of urea ( mol. =56 g "mol"^(-1) ) boils at 100.18^(@)C at t...

    Text Solution

    |

  17. 1.00 g of a non electrolyte solute ( molar mass 250 " g mol"^(-1)) was...

    Text Solution

    |

  18. During osmosis, flow of water through a semi permeable membrane is

    Text Solution

    |

  19. Calculate the freezing point of a solution that contains 30 g urea in ...

    Text Solution

    |

  20. A 5% solution of sugarcane ( mol. wt. 342 ) is isotonic with 1% soluti...

    Text Solution

    |