Published by:
CGP EDU Academic Team
Published on: August 11, 2026
An open manometer attached to a flask containing ammonia gas have no difference in mercury level initially as shown in diagram. After sparking into the flask, ammonia is partially dissociated as 2NH 3 (g) 
N 2 (g) + 3H 2 (g). Now it have difference of 18 cm in mercury level in two columns, what is partial pressure of H 2 (g) at equilibrium ?
Text Solution
Verified by ExpertsThe correct answer is:
C
27cmofHg
2NH 3 (g) 
N 2 (g) + 3H 2
76 - 2x x 3x
76 + 2x = 76 + 18
2x = 18
x = 9
= 27 cm of Hg
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