Question

At the same temperature, HCl gas and NH${}_3$ gas are present in two vessels of same volume at a pressure of 'P' atmospheres each. When one jar is inverted over the other so that the two will mix, after some time the pressure in the vessels will become:

• A. $\frac{P}{2}$
• B. $\frac{P}{4}$
• C. Zero
• D. P

Answer 1

Answer: (C)

Zero

$N{H}_3+HCl\to N{H}_{4}Cl\left(solid\right)$

Due to the formation of a solid, final pressure in the vessel will become zero.

Hence, the correct answer is option $\text{C}$.