wiz-icon
MyQuestionIcon
MyQuestionIcon
4
You visited us 4 times! Enjoying our articles? Unlock Full Access!
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
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
Positive
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
Zero
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
Undefined
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B Positive
Equillibrium is represented as:
N2O4colorless2NO2brown
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.
Option B is correct.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Le Chateliers Principle
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon