Home
Class 12
CHEMISTRY
In a flask, colourless N(2)O(4) is in eq...

In a flask, colourless `N_(2)O_(4)` is in equilibrium with brown-coloured `NO_(2)`. At equilibrium, when the flask is heated to `100^(@)C` the brown colour deepens and on cooling, the brown colour became less coloured. The change in enthalpy `DeltaH` for the ayatem is

A

negative

B

positive

C

zero

D

not defined

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

A colourless gas X forms a brown coloured gas when mixed with air. The gas X is

When a green iron salt is heated strongly, its colour finally changes to brown and odour of burning sulphur is given out. Name the iron salt.

A one litre flask is full of brown bromine vapours. The intensity of brown colour of vapour will not decrease apprciably on adding to the flask some.

One litre flask is full of brown bromine fumes. The intensity of brown colour of vapour will not decreases appreciably on adding to the flask some

A one litre flask is full of reddish brown bromine fumes. The intensity of brown colour of vapour will not decrease appreciably on adding to the flask some :

On heating copper turnings with conc. HNO_(3) , a brown coloured gas is evolved which upon cooling dimerises. Identify the gas.

ALLEN-TEST PAPER 3-CHEMISTRY
  1. P hArr Q, K1 1/3RhArr 1/2Q,K2 2R hArr 2S, K3 P hArr S, K4 =? ...

    Text Solution

    |

  2. In the reaction , A(s) +B(g) + "heat" hArr 2C(s) + 2D(g) at equili...

    Text Solution

    |

  3. For which of the following gaseous reactions, the relationship log KC/...

    Text Solution

    |

  4. At which temperature, P C K K KP/KC value will be 1/4 for dissociatio...

    Text Solution

    |

  5. Equilibrium constants for (a) N2 + O2 hArr 2NO and (b) 2NO + O2 ƒhArr ...

    Text Solution

    |

  6. At t^@C temperature, the observed vapour density of A is 17.5 for the ...

    Text Solution

    |

  7. For the reaction A((s)) + 2B((g)) ƒhArr 3C((g)) . At constant pressur...

    Text Solution

    |

  8. Which of following does not show common ion effect ?

    Text Solution

    |

  9. For the reaction 3A(g)+B(g) hArr 2C(g) at a given temperature , Kc=9.0...

    Text Solution

    |

  10. The dissociation constant of acetic acid at a given temperature is 1.6...

    Text Solution

    |

  11. 6g weak acid HA(molecular Wt. = 60 g/mol) is dissolved in water and fo...

    Text Solution

    |

  12. PbOhArrPb+1/2O2, K=2xx10^(-1) ZnOhArr +1/2 O2 K=2xx10^2 CuOhArr +...

    Text Solution

    |

  13. For the reaction, 3O2(g) hArr ƒ2O3(g)KC at 25^@C for this equilibrium ...

    Text Solution

    |

  14. Acidic strength of CH3 COOH in presence of CH3 COONa :-

    Text Solution

    |

  15. Equilibrium constant KC for the following reaction at 800K is 4. NH3...

    Text Solution

    |

  16. In a flask, colourless N(2)O(4) is in equilibrium with brown-coloured ...

    Text Solution

    |

  17. A + B ƒhArr C + D, Kc = 5 If at some time the concentration of A, B, ...

    Text Solution

    |

  18. For pure water (pH=7), K(w) at 298 is 10^(-14). On adding some acid t...

    Text Solution

    |

  19. What should be the concentration of a weak electrolyte AB, When its de...

    Text Solution

    |

  20. Which of the following statement for pure water is wrong ?

    Text Solution

    |