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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

Undefined

Text Solution

Verified by Experts

The correct Answer is:
B
The reaction is endothermic, so on getting energy, forward reaction is favoured producing more `NO_(2)`. This causes colour to deepen.
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DINESH PUBLICATION-CHEMICAL THERMODYNAMICS AND CHEMICAL ENERGETICS -Exercise
  1. The following is(are) endothermic reaction (s):

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  2. Among the following, the intensive property is (properties are) :

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

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  4. The gas with the highest heat of combustion is :

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  5. Given NH(3)(g)+3Cl(2)(g)toNCl(3)(g)+3HCl(g)+x(1) N(2)(g)+3H(2)(g)t...

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  6. A scientist needs a refrigeration machine to maintain temperature of -...

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  7. Under the same conditions, how many mL of 1M KOH and 0.5M H(2)SO(4)sol...

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  8. The standard molar heats of formation of ethane, carbon dioxide, and l...

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  9. The enthalpy of combustion of H(2) , cyclohexene (C(6)H(10)) and cyclo...

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  10. Which of the following is an endothermic reaction?

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  11. The heat released when NH(4)OH and HCl neutralise is

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  12. The difference between the heats of reaction at constant pressure and ...

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  13. Which of the following equations represents standard heat of combustio...

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  14. Identify the state quantiy among the following

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  15. The DeltaH(f)^(@) for CO(2)(g), CO(g) and H(2)O(g) are -395.5,-110.5 a...

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  16. Which of the following statement is false ?

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  17. In thermodynamics, a process is called reversible when

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  18. One mole of non-ideal gas undergoes a change of state (2.0 "atm", 3.0 ...

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  19. Which of the following reactions will define DeltaH(f)^(@) ?

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  20. The enthalpy of vaporisation of a liquid is 30 kJ mol^(-1) and entropy...

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