Home
Class 12
CHEMISTRY
N(2(g))+2O(2(g)) rarr 2NO(2) +X kJ 2NO...

`N_(2(g))+2O_(2(g)) rarr 2NO_(2) +X kJ`
`2NO_((g))+O_(2(g)) rarr 2NO_(2(g))+Y kJ`
The enthalpy of formation of `NO` is

A

(2X-2Y)

B

X-Y

C

`1/2 (Y-X)`

D

`1/2 (X- Y)`

Text Solution

Verified by Experts

The correct Answer is:
C
Aim : `1/2 N_2 + 1/2 O_2 rarr NO. `
Operate `1/2` Eqn . (i) `-1/2` Eqn (ii) ,
`therefore Delta H= (-X-(-Y))/(2)= (Y-X)/(2)`
Promotional Banner

Topper's Solved these Questions

  • Chemical Thermodynamics & Energetics

    NIKITA PUBLICATION|Exercise QUESTION FROM COMPETITIVE EXAM|35 Videos

  • CHEMICAL KINETICS

    NIKITA PUBLICATION|Exercise MCQs|351 Videos

  • CHEMISTRY IN EVERYDAY LIFE

    NIKITA PUBLICATION|Exercise MCQs|224 Videos

Similar Questions

Explore conceptually related problems

Given that : 2CO_((g))+O_(2(g))rarr2CO_(2(g)),DeltaH^(@)=-P kJ C_((s))+O_(2(g))rarr CO_(2(g)), DeltaH^(@)=-Q kJ the enthalpy of formation of carbon monoxide is :

2CO_((g))+O_(2(g))rarr 2CO_(2(g))+X KJ In the above equation X KJ refers to :

The following two reaction are known :- N_(2(g))+O_(2(g))hArr2NO_((g)),DeltaH=-27.1KJ 2N_(2(g))+O_(2(g))hArr2NO_(2(g)),DeltaH=-53.5KJ Calculate the enthalpy change for the reaction NO_(2(g))hArr(1)/(2)N_(2(g))+O_(2(g))

Consider the following reactions: C(s)+O_(2)(g)toCO_(2)(g)+x " kJ" CO(g)+(1)/(2)O_(2)(g)toCO_(2)(g)+y" kJ" The heat formation of CO(g) is :

Calculate the standard enegry change for the reaction: OF_(2)(g) +H_(2)O(g) rarr O_(2)(g) +2HF(g) at 298K The standard enthalpies of formation of OF_(2)(g), H_(2)O(g) , and HF(g) are +20, -250 , and -270 kJ mol^(-1) , respectively.

NIKITA PUBLICATION-Chemical Thermodynamics & Energetics-QUESTION FROM COMPETITIVE EXAM
  1. N(2(g))+2O(2(g)) rarr 2NO(2) +X kJ 2NO((g))+O(2(g)) rarr 2NO(2(g))+Y...

    Text Solution

    |

  2. For an endothermic reaction where DeltaH represent the enthalpy of rea...

    Text Solution

    |

  3. Standard entropy of X(2) , Y(2) and XY(3) are 60, 40 and 50JK^(-1)mol...

    Text Solution

    |

  4. Match List I (Equations) with List II (Type of processes) and select t...

    Text Solution

    |

  5. Three moles of an ideal gas expanded spontaneously into vacuum. The wo...

    Text Solution

    |

  6. For vaporization of water at 1 atmospheric pressure the values of Delt...

    Text Solution

    |

  7. The following two reactionas are known FeO(3)(s)+3CO(g)rarr2Fe(s)+CO...

    Text Solution

    |

  8. If the enthaply change for the transition of liquid water to steam is...

    Text Solution

    |

  9. Enthalpy change for the reaction, 4H((g))rarr 2H(2(g)) is -869.6 kJ ...

    Text Solution

    |

  10. Consider the following processes :- {:(,DeltaH(kJ//mol)),((1)/(2)A r...

    Text Solution

    |

  11. In view of the signs of Delta(r)G^(0) for the following reactions Pb...

    Text Solution

    |

  12. The value of enthalpy change (DeltaH) for the reaction C(2)H(5)OH (l...

    Text Solution

    |

  13. Consider the reaction, 4NO(2)(g)+O(2)(g)rarr2N(2)O(5)(g),Delta(r )H=...

    Text Solution

    |

  14. Match the transformation in colums I with appropriate options in colum...

    Text Solution

    |

  15. The entropy change involved in the isothermal reversible expansion of ...

    Text Solution

    |

  16. Which of the following is correct option for the free expansion of an ...

    Text Solution

    |

  17. The Gibbs energy for the decomposition of Al(2)O(3) at 500^(@)C is as...

    Text Solution

    |

  18. The entropy change involved in the isothermal reversible expansion of ...

    Text Solution

    |

  19. The incorrect expression among the following is

    Text Solution

    |

  20. In which of the following reactions,standard reaction entropy change(D...

    Text Solution

    |

  21. The enthalpy of fusion of water is 1.435 kcal//"mole". The molar entro...

    Text Solution

    |