Home
Class 11
CHEMISTRY
If Delta H("ionisation")^(@) for HCN and...

If `Delta H_("ionisation")^(@)` for HCN and `CH_(3)COOH` are `45.2` and `2.1 KJ mol^(-1)` , which one of the following is correct ?

A

`pK_(a(HCN))ltpK_(a(CH_(3)COOH))`

B

`pK_(a(HCN))gtpK_(a(CH_(3)COOH))`

C

`pK_(a(HCN))=pK_(a(CH_(3)COOH))`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
More is heat of ionisation, more is stability of molecule or lesser is dissociation. Thus
`K_(a)(CH_(3)COOH)gtK_(a)(HCN)`
Therefore `pK_(a)(HCN)gtpK_(a)(CH_(3)COOH)`
Promotional Banner

Topper's Solved these Questions

  • IONIC EQUILIBRIUM

    P BAHADUR|Exercise Exercise3B|30 Videos

  • IONIC EQUILIBRIUM

    P BAHADUR|Exercise Exercise4|32 Videos

  • IONIC EQUILIBRIUM

    P BAHADUR|Exercise Exercise2|52 Videos

  • GASEOUS STATE

    P BAHADUR|Exercise Exercise -9|1 Videos

  • MOLE AND EQUIVALENT CONCEPT

    P BAHADUR|Exercise Exercise 9 Advanced numerical problems|61 Videos

Similar Questions

Explore conceptually related problems

Given Delta_("ioniz")H^(o)(HCN)=45.2 kJ mol^(-1) and Delta_("ioniz")H^(o)(CH_(3)COOH)=2.1 kJ mol^(-1) . Which one of the following facts is ture?

Given Delta_(i)H^(Theta)(HCN) = 45.2 kJ mol^(-1) and Delta_(i)H^(Theta)(CH_(3)COOH) = 2.1 kJ mol^(-1) . Which one of the following facts is true?

For a reaction, CaCO_(3(s)) rarr CaO_((s))+CO_(2(g)) Delta_(f)H^(@)(CaO)=-"631.1 kJ mol"^(-1) Delta_(f)H^(@)(CO_(2))=-"393.5 kJ mol"^(-1) and Delta_(f)H^(@)(CaCO_(3))=-"1206.9 kJ mol"^(-1) Which of the following is a correct statement?

Given : Enthalpy of ioinization of two acids : triangleH^(@)(HCN)=45.2 KJ mol^(-) triangleH^(@)(CH_(3)COOH)=2.1 KJ mol^(-) which relationshop for the two acids is true ?

P BAHADUR-IONIC EQUILIBRIUM-Exercise3A
  1. Number of H^(+) ions present in 10 mL of solution of pH=3 are:

    Text Solution

    |

  2. For pure water:

    Text Solution

    |

  3. If Delta H("ionisation")^(@) for HCN and CH(3)COOH are 45.2 and 2.1 KJ...

    Text Solution

    |

  4. The self ionisation constant for pure HCOOH, K = [HCOO overset(o+)H(2)...

    Text Solution

    |

  5. Liquid NH(3) ionises to a slight extent. At -50^(@)C, its ionic produc...

    Text Solution

    |

  6. The concentration of fluroacetic acid (K(a)of acid =2.6xx10^(-3)), whi...

    Text Solution

    |

  7. The pH of pure water at 25^(@)C and 35^(@)C are 7 and 6, respectively....

    Text Solution

    |

  8. The pH of a solution obtained by mixing 10 mL of 0.1MHCI and 40mL of 0...

    Text Solution

    |

  9. The pH of a solution obtained by mixing 100mL of 0.1M HCI and 9.9mL of...

    Text Solution

    |

  10. What will be the resultant pH, when 200 mL of an aqueous solution of H...

    Text Solution

    |

  11. K(a) for formic acid and acetic acid are 2.1xx10^(-4) and 1.1xx10^(-5)...

    Text Solution

    |

  12. What volume of 0.1M sodium formate solution should be added to 50 mL o...

    Text Solution

    |

  13. How many mole of HCI will be required to prepare one litre of buffer ...

    Text Solution

    |

  14. The composition of an acidic buffer mixture made up of HA and NaA of t...

    Text Solution

    |

  15. A weak acid HA after teratment with 12 mL of 0.1M strong base BOH has ...

    Text Solution

    |

  16. Zn salt is mixed with (NH(4))(2)S of molarity 0.021M. The amount of Zn...

    Text Solution

    |

  17. Calculate pH at which Mg(OH)(2) begins to precipitate from a solution ...

    Text Solution

    |

  18. The concentration of hydroxyl ion in a solution left after mixing 100 ...

    Text Solution

    |

  19. 0.1 millimole of CdSO(4) are present in 10 mL acid solution of 0.08N H...

    Text Solution

    |

  20. An acid type indicator, H In differs in colour from its conjugate base...

    Text Solution

    |