Home
Class 12
CHEMISTRY
In a flask colourless N2O4 is in equilib...

In a flask colourless `N_2O_4` is in equilibrium with brown coloured `NO_2`. At equilibrium, when the flask is heated at `100^@C` the brown colour deepens and on cooling it becomes less coloured. The change in enthalpy, `DeltaH` for this system is

A

Negative

B

Positive

C

Zero

D

Undefined

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT (Section - B) Objective Type Questions|35 Videos

  • THERMODYNAMICS

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT (Section - C) Previous Years Questions|60 Videos

  • THERMODYNAMICS

    AAKASH INSTITUTE ENGLISH|Exercise Exercise|50 Videos

  • THE SOLID STATE

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (SECTION - D) (ASSERTION-REASON TYPE QUESTION)|20 Videos

Similar Questions

Explore conceptually related problems

When a sample of NO_(2) is placed in a container, this equilibrium is rapidly estabilished. 2NO_(2)(g) hArr N_(2)O_(4)(g) Iff this equilibrium mixture is a darker colour at high temperatures annd at low pressure, which of these statements about the reaction is true?

Give the electronic configuration of the How does the colour change on heating [Ti(H_2O)_6]^(3+) ion?

Borax Bead Test is carried out when the original mixture is coloured. It is done with the help of a cleam platinum wire on which a small loop is made at the end. When borax is heated on platinum wire loop transparent glass like bead is obtained. The hot bead is brought in contact with salt till it reacts with fused borax and colour is imparted to the bead. bead colour is noted. {:("Colour of the bead","Ion"),(1." Blue green",Cu^(2+)),(2." Yellow ",Fe^(3+)),(3." Green",Cr^(3+)),(4." Violet",Mn^(2+)),(5." Dark blue",Co^(2+)),(6." Brown",Ni^(2+)):} Q. The flame used in Borax Bead Test is:

Borax Bead Test is carried out when the original mixture is coloured. It is done with the help of a cleam platinum wire on which a small loop is made at the end. When borax is heated on platinum wire loop transparent glass like bead is obtained. The hot bead is brought in contact with salt till it reacts with fused borax and colour is imparted to the bead. bead colour is noted. {:("Colour of the bead","Ion"),(1." Blue green",Cu^(2+)),(2." Yellow ",Fe^(3+)),(3." Green",Cr^(3+)),(4." Violet",Mn^(2+)),(5." Dark blue",Co^(2+)),(6." Brown",Ni^(2+)):} Q. Glassy bead of :

Borax Bead Test is carried out when the original mixture is coloured. It is done with the help of a cleam platinum wire on which a small loop is made at the end. When borax is heated on platinum wire loop transparent glass like bead is obtained. The hot bead is brought in contact with salt till it reacts with fused borax and colour is imparted to the bead. bead colour is noted. {:("Colour of the bead","Ion"),(1." Blue green",Cu^(2+)),(2." Yellow ",Fe^(3+)),(3." Green",Cr^(3+)),(4." Violet",Mn^(2+)),(5." Dark blue",Co^(2+)),(6." Brown",Ni^(2+)):} Q. Blue bead can be of:

Borax Bead Test is carried out when the original mixture is coloured. It is done with the help of a cleam platinum wire on which a small loop is made at the end. When borax is heated on platinum wire loop transparent glass like bead is obtained. The hot bead is brought in contact with salt till it reacts with fused borax and colour is imparted to the bead. bead colour is noted. {:("Colour of the bead","Ion"),(1." Blue green",Cu^(2+)),(2." Yellow ",Fe^(3+)),(3." Green",Cr^(3+)),(4." Violet",Mn^(2+)),(5." Dark blue",Co^(2+)),(6." Brown",Ni^(2+)):} Q. Glassy bead of :

When a salt is heated with dil H_(2)SO_(4) and KMnO_(4) solution the pink colour of KMnO_(4) is dicharged, the mixture may contain

When a salt is heated with dilute H_(2)SO_(4) " and " KMnO_(4) solution, the pink colour of KMnO_(4) is discharged, the salt is :

9.2 grams of N_(2)O_(4(g)) is taken in a closed one litre vessel and heated till the following equilibrium is reached N_(2)O_(4(g))hArr2NO_(2(g)) . At equilibrium, 50% N_(2)O_(4(g)) is dissociated. What is the equilibrium constant (in mol litre^(-1) ) (Molecular weight of N_(2)O_(4) = 92 ) ?

9.2 grams of N_(2)O_(4(g)) is taken in a closed one litre vessel and heated till the following equilibrium is reached N_(2)O_(4(g))hArr2NO_(2(g)) . At equilibrium, 50% N_(2)O_(4(g)) is dissociated. What is the equilibrium constant (in mol litre^(-1) ) (Molecular weight of N_(2)O_(4) = 92 ) ?

AAKASH INSTITUTE ENGLISH-THERMODYNAMICS-ASSIGNMENT (Section - A) Objective Type Questions
  1. The enthalpy of reaction, 2HC = CH + 5O(2) rightarrow 4CO(2) + 2H(2)O ...

    Text Solution

    |

  2. Calculate heat of formation of isoprene using bond energy data. 5C(s...

    Text Solution

    |

  3. In a flask colourless N2O4 is in equilibrium with brown coloured NO2. ...

    Text Solution

    |

  4. For which of these reactions will there be Delta S positive?

    Text Solution

    |

  5. For stretched rubber, Entropy

    Text Solution

    |

  6. The most random state of H(2)O system is

    Text Solution

    |

  7. Delta S for the reaction , MgCO(3)(s)rarr MgO(s)+CO(2)(g) will be :

    Text Solution

    |

  8. The standard entroples of N(2)(g), H(2) (g) and NH(3) (g) are 191.5, 1...

    Text Solution

    |

  9. What is the increase in entropy when 11.2 L of O(2) are mixed with 11....

    Text Solution

    |

  10. Given S(C(2)H(6))^(@) = 225 J mol^(-1) K^(-1) , S(C(2)H(4)^(@) = 220...

    Text Solution

    |

  11. For the meltig of NaCI heat require is 7.26 kcal mol^(-1) and Delta S ...

    Text Solution

    |

  12. The DeltaS for the reaction 2H(2)(g) + O(2)(g) rightarrow 2H(2)O(I) ...

    Text Solution

    |

  13. Which of the following is correct ?

    Text Solution

    |

  14. Entropy of vaporisation of water at 100^(@)C, if molar heat of vaporis...

    Text Solution

    |

  15. A particular reaction at 27^(@)C for which DeltaH gt 0 and DeltaS gt 0...

    Text Solution

    |

  16. It is impossible for a reaction to take place if (a)Δ H i s + v e an...

    Text Solution

    |

  17. Ths standard free energy change Delta G^(@) is related to K (equilibri...

    Text Solution

    |

  18. The sole criterion for the spontaneity of a process is

    Text Solution

    |

  19. For an endothermic reaction to be spontaneous

    Text Solution

    |

  20. At 27^(@)C for reaction, C(6)H(6)(l)+(15)/(2)O(2)(g)to6CO(2)(g)+3H(2...

    Text Solution

    |