Le Chatelier's Principle for Del N Greater Than Zero
In a flask co...
Question
In a flask colourless N2O4 is in equilibrium with brown coloured NO2. At equilibrium when the flask is heated at 100oC, the brown colour deepens and on cooling it becomes less coloured. The change in enthalpy, ΔH for formation of NO2 is:
A
Negative
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B
Positive
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C
Zero
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D
Undefined
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Solution
The correct option is B Positive Equillibrium is represented as:
N2O4colorless⇌2NO2brown
Upon heating equilibrium goes forward, and revert back on cooling
Therefore energy is absorbed by the system to produce NO2, hence it is an endothermic process and thus the sign of enthalpy of formation of NO2 is positive.